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Contorted concretionary forms (bowel stone).",3,3.5,"2.98","2.95","Vitreous, greasy","Vitreous,Greasy,Pearly","Pearly on {010}","Transparent,Translucent","White, off-white, greyish","Colourless, bluish, blue-grey, violet, burgundy-red, white, rose-pink, brownish, reddish, grey, dark grey; colourless in transmitted light",[58,59,60,61,62,63,64,65,66],"colorless","blue","gray","white","purple","red","pink","brown","yellow",[61,60],"Can show fluorescence under LW and\u002For SW.\r\nFor example: bluish white response to SW: https:\u002F\u002Fwww.mindat.org\u002Fphoto-1254482.html","On {010} perfect; on {100} nearly perfect; on {001} good to imperfect.","Perfect","Irregular\u002FUneven,Splintery","brittle","Biaxial","+","1.567","1.574","1.579","1.609","1.618","44","36","45",1.567,1.618,"Strong, r \u003C v.","Visible","Violet coloured material: X = colourless to very light yellow or rose; Y = light violet or rose; Z = violet.","Absorption: Z > Y > X.","X = b; Y = a; Z = c.","Inverts to α-CaSO4 at 1193°C. Melting Point = ~ 1450°C.\r\nBefore the blowpipe, fuses at 3, coloring the flame reddish yellow, giving an enamel-like bead which reacts alkaline.","Soluble in HCl. Soluble in ~500 parts water.","Sedimentary evaporite deposits, cap rock of salt domes.","Mining Academy, Freiberg, Germany 16538","Isostructural with Ferruccite; isostructural and isomorphous with α-BaSO4 and α-SrSO4.\r\n\r\nReadily alters to gypsum.","Named in 1804 by Abraham Gottlob Werner from the Greek άνυδρος (\"anhydros\") meaning \"without water\", in allusion to the lack of water in its composition, in contrast to \u003CM>gypsum\u003C\u002FM>, which contains water.","2026-03-09 16:18:53",[98,101,104],{"id":99,"name":100,"entrytype":42,"csystem":11,"ima_formula":11,"mindat_formula":14,"hmin":11,"hmax":11,"dmeas":37,"dcalc":37,"primary_image_id":11},232,"Angelite",{"id":102,"name":103,"entrytype":42,"csystem":11,"ima_formula":11,"mindat_formula":14,"hmin":11,"hmax":11,"dmeas":37,"dcalc":37,"primary_image_id":11},30863,"Bowel 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Austria",47.3252251,11.4763784,"Austria",1735,[304,307,310,314,317,321,325,328,332,335,338,341,344,348,352,356,360,364,369,372,376,380,384,388,392,396,400,404,408,412,416,420,424,428,431,435,439,443,447,450,454,458,462,466,470,474,478,483,487,491,496,501,505,509,513,516,519,524,528,532],{"id":305,"year":11,"html":306,"doi":11},18265658,"Newman, E.S. (1941): BEHAVIOR OF CALCIUM SULFATE AT HIGH\nTEMPERATURES. Journal of Research of the National Bureau of Standards, 27, 191-196. https:\u002F\u002Fnvlpubs.nist.gov\u002Fnistpubs\u002Fjres\u002F27\u002Fjresv27n2p191_A1b.pdf",{"id":308,"year":11,"html":309,"doi":11},19459707,"Langbein, R. (1979): Petrologische Aspekte der Anhydritbildung. Zeitschrift für geologische Wissenschaften, 7 (7), 913-926.",{"id":311,"year":312,"html":313,"doi":11},16100617,1794,"von Fichtel, J.E. (1794) Vom Lilalith. Mineralogische Aufsätze, Wien: 226-236. [as salzsaurer Kalk, Muriazit, schuppiger Gypsstein, footnote on p. 228 refering to Abbé Nicolaus Poda von Neuhaus].",{"id":315,"year":312,"html":316,"doi":11},16100618,"Poda, A.N. (1794) Vom Lilalith. in: Mineralogische Aufsätze, Mathias Andreas Schmidt (Wein) 226-236.",{"id":318,"year":319,"html":320,"doi":11},16100619,1800,"Werner (1800). [as Würfelspath].",{"id":322,"year":323,"html":324,"doi":11},16100620,1801,"Haüy, R.J. (1801) Traité de minéralogie. First edition: in 4 volumes with atlas in fol.: 2. [as Soude muriatée gypsifère (of Hall); from Klaproth's analysis in Beiträge: 1: 307 (1795)].",{"id":326,"year":323,"html":327,"doi":11},16100621,"Haüy, R.J. (1801) Chaux sulfatée anhydre, c'est-à-dire, privée d'eau. Traité de minéralogie. First edition: in 4 volumes with atlas in fol.: 4: 348-353. [as Chaux sulfatée anhydre (from Bex) Vauquelin].",{"id":329,"year":330,"html":331,"doi":11},16100622,1803,"Klaproth, M.H. (1803) Chemische Untersuchung des Muriacit. Neues Allgemeines Journal der Chemie: 1: 355-362.",{"id":333,"year":330,"html":334,"doi":11},16100623,"Ludwig, C.F. (1803) Handbuch der Mineralogie nach A.G. Werner. 2 volumes, Leipzig: 1: 51, 166. [as Cube Spar].",{"id":336,"year":330,"html":337,"doi":11},16100624,"Werner (1803). [as Anhydrit].",{"id":339,"year":176,"html":340,"doi":11},16100625,"Flurl, M. (1804) Einige Bemerkungen über den wasserfreyen Gyps (Anhydrit) und den Muriacit oder Würfelspath. Physikalische Abhandlungen der Königlich - Baierischen Akademie der Wissenschaften: 2: 128-140.",{"id":342,"year":176,"html":343,"doi":11},16100626,"Ludwig, C.F. (1804) A. G. Werners Mineral - System, Erste Klasse Erdige Fossilien, VI. Kalk - Geschlecht. Handbuch der Mineralogie nach A.G. Werner. 2 volumes, Leipzig: 2: 169,170. [as Kieselgyps; Vulpinit, Würfelgyps].",{"id":345,"year":346,"html":347,"doi":11},18300998,1807,"Klaproth, M. H. (1807) CXLVII. Untersuchung des Anhydrits. In \u003Ci>Beiträge zur chemischen Kenntniss der Mineralkörper\u003C\u002Fi> Vol. 4. Rottmann. p.224-235.",{"id":349,"year":350,"html":351,"doi":11},17557205,1813,"Hausmann, Johann Friedrich Ludwig (1813) \u003Ci>Handbuch der Mineralogie\u003C\u002Fi> (1st ed.). Vandenhoeck und Ruprecht. \u003Ca target='_blank' href='https:\u002F\u002Farchive.org\u002Fdownload\u002Fhandbuchdermine01hausgoog\u002Fhandbuchdermine01hausgoog.pdf' class='refpdflink'>\u003C\u002Fa>",{"id":353,"year":354,"html":355,"doi":11},16100629,1860,"Schrauf (1860) Königliche Akademie der Wissenschaften, Sitzungsberichte, Vienna: 39: 887.",{"id":357,"year":358,"html":359,"doi":11},16100630,1872,"Hessenberg (1872) Senck. Ges. Frankfurt, Abh.: 8: 1.",{"id":361,"year":362,"html":363,"doi":11},16100631,1883,"Mügge (1883) Neues Jahrbuch für Mineralogie, Geologie und Paläontologie, Heidelberg, Stuttgart: II: 258.",{"id":365,"year":366,"html":367,"doi":368},1127700,1886,"Goldschmidt, Victor (1886) \u003Ci>Index der Krystallformen der Mineralien\u003C\u002Fi> Vol. 1. Springer Berlin Heidelberg. \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.1007\u002F978-3-662-28591-6'>doi:10.1007\u002F978-3-662-28591-6\u003C\u002Fa> \u003Ca target='_blank' href='https:\u002F\u002Fcloudflare-ipfs.com\u002Fipfs\u002Fbafykbzacebudegzfdc2kttzf67r5f4bvgfwhd27p367x3au5zzlhzzrwt3rfe?filename=Dr.%20Victor%20Goldschmidt%20%28auth.%29%20-%20Index%20der%20Krystallformen%20der%20Mineralien_%20Erster%20Band-Springer-Verlag%20Berlin%20Heidelberg%20%281886%29.pdf' class='refpdflink'>\u003C\u002Fa>","10.1007\u002F978-3-662-28591-6",{"id":370,"year":366,"html":371,"doi":11},16100632,"Danker (1886) Neues Jahrbuch für Mineralogie, Geologie und Paläontologie, Beil.-Bd., Heidelberg, Stuttgart: 4: 272.",{"id":373,"year":374,"html":375,"doi":11},16100634,1888,"Mülheims (1888) Zeitschrift für Kristallographie, Mineralogie und Petrographie: 14: 228.",{"id":377,"year":378,"html":379,"doi":11},1118647,1892,"Dana, Edward Salisbury; Dana, James Dwight (1892) \u003Ci>A System of Mineralogy\u003C\u002Fi> (6th ed.). John Wiley & Sons, Inc.",{"id":381,"year":382,"html":383,"doi":11},16100636,1893,"Zimányi (1893) Zeitschrift für Kristallographie, Mineralogie und Petrographie: 22: 341.",{"id":385,"year":386,"html":387,"doi":11},16100637,1898,"Mügge (1898) Neues Jahrbuch für Mineralogie, Geologie und Paläontologie, Heidelberg, Stuttgart: I: 71.",{"id":389,"year":390,"html":391,"doi":11},16100638,1899,"Vater (1899) Zeitschrift für Kristallographie, Mineralogie und Petrographie: 31: 571.",{"id":393,"year":394,"html":395,"doi":11},16100639,1907,"Sommerfeldt (1907) Neues Jahrbuch für Mineralogie, Geologie und Paläontologie, Heidelberg, Stuttgart: I: 139 (as Metanhydrit).",{"id":397,"year":398,"html":399,"doi":11},16100640,1909,"Sommerfeldt (1909) Zentralblatt für Mineralogie, Geologie und Paläontologie, Stuttgart: 22: 189 (as Metanhydrit).",{"id":401,"year":402,"html":403,"doi":11},16100641,1911,"Kolb (1911) Zeitschrift für Kristallographie, Mineralogie und Petrographieg: 49: 14: 25.",{"id":405,"year":406,"html":407,"doi":11},4468623,1913,"(1913) \u003Ci>Atlas Der Krystallformen\u003C\u002Fi> Vol. 1 - Text - Band I - Adamin-Buntkupfererz. Carl Winters Universitätsbuchhandlung, Heidelberg.",{"id":409,"year":410,"html":411,"doi":11},16100643,1916,"Emerson (1916) American Journal of Science: 42: 233.",{"id":413,"year":414,"html":415,"doi":11},16100644,1919,"Butler (1919) Economic Geology: 14: 581.",{"id":417,"year":418,"html":419,"doi":11},16100645,1922,"Veit (1922) Neues Jahrbuch für Mineralogie, Geologie und Paleontologie, Heidelberg, Beil.-Bd., Stuttgart: 45: 133.",{"id":421,"year":422,"html":423,"doi":11},16100646,1925,"Kinoshita (1925) Journal of the Geological Society of Tokyo: 32: 9.",{"id":425,"year":426,"html":427,"doi":11},16100647,1926,"Basche and Mark (1926) Zeitschrift für Kristallographie, Mineralogie und Petrographie: 64: 22.",{"id":429,"year":426,"html":430,"doi":11},16100648,"Dickson and Binks (1926) Philosophical Magazine and Journal of Science: 2: 114.",{"id":432,"year":433,"html":434,"doi":11},16100649,1929,"Hintze, Carl (1929) Handbuch der Mineralogie. Berlin and Leipzig. 6 volumes: 1 (3B): 3735, 3780.",{"id":436,"year":437,"html":438,"doi":11},16100650,1932,"Schaller (1932) USGS Bulletin 832.",{"id":440,"year":441,"html":442,"doi":11},16100651,1933,"Berek and Strieder (1933) Zeitschrift für Kristallographie, Mineralogie und Petrographie: 86: 212.",{"id":444,"year":445,"html":446,"doi":11},16100652,1934,"Tertsch (1934) Zeitschrift für Kristallographie, Mineralogie und Petrographie: 87: 326.",{"id":448,"year":184,"html":449,"doi":11},16100653,"Przibram (1936) Kali: 30: 61.",{"id":451,"year":452,"html":453,"doi":11},16100654,1940,"Posnjak (1940) American Journal of Science: 238: 559.",{"id":455,"year":456,"html":457,"doi":11},16100655,1945,"Engelhardt (1945) Chemie der Erde: 15: 424.",{"id":459,"year":460,"html":461,"doi":11},16100656,1947,"Zimmer, P.W. (1947) Anhydrite and gypsum in the Lyon Mountain magnetite deposit of the northeastern Adirondacks. American Mineralogist: 32: 647.",{"id":463,"year":464,"html":465,"doi":11},1118652,1951,"Palache, Charles; Berman, Harry; Frondel, Clifford (1951) \u003Ci>The System of Mineralogy\u003C\u002Fi> (7th ed.) Vol. 2 - Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons.",{"id":467,"year":468,"html":469,"doi":11},16100658,1958,"Groves, A.W. (1958) Gypsum and Anhydrite, 108 p. Overseas Geological Surveys, London.",{"id":471,"year":472,"html":473,"doi":11},16100659,1962,"Höhne, E. (1962) A more accurate determination of the crystal structure of anhydrite, CaSO4. Soviet Physics - Crystallography: 7: 559-569.",{"id":475,"year":476,"html":477,"doi":11},16100660,1967,"Hardie, L.A. (1967) The gypsum-anhydrite equilibrium at one atmosphere pressure. American Mineralogist: 52: 171-200.",{"id":479,"year":480,"html":481,"doi":482},9551941,1973,"Berenblut, B.J., Dawson, P., Wilkinson, G.R. (1973) A comparison of the Raman spectra of anhydrite (CaSO4) and gypsum (CaSO4).2H2O). \u003Ci>Spectrochimica Acta Part A: Molecular Spectroscopy\u003C\u002Fi>, 29 (1). 29-36 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.1016\u002F0584-8539(73)80005-4'>doi:10.1016\u002F0584-8539(73)80005-4\u003C\u002Fa>","10.1016\u002F0584-8539(73)80005-4",{"id":484,"year":485,"html":486,"doi":11},16100661,1975,"Hawthorne, F.C., Ferguson, R.B. (1975) Anhydrous sulphates. II. Refinement of the crystal structure of anhydrite. The Canadian Mineralogist: 13: 289-292.",{"id":488,"year":489,"html":490,"doi":11},16100662,1988,"Ramboz, C., Oudin, E., Thisse, Y. (1988) Geyser-type discharge in the Atlantis II Deep, Red Sea: evidence of boiling from fluid inclusions in epigenetic anhydrite. The Canadian Mineralogist: 26: 765-786.",{"id":492,"year":493,"html":494,"doi":495},2419368,1998,"Sarma, L. P., Prasad, P. S. R., Ravikumar, N. (1998) Raman spectroscopic study of phase transitions in natural gypsum. \u003Ci>Journal of Raman Spectroscopy\u003C\u002Fi>, 29 (9). 851-856 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.1002\u002F(sici)1097-4555(199809)29:9\u003C851::aid-jrs313>3.0.co;2-s'>doi:10.1002\u002F(sici)1097-4555(199809)29:9\u003C851::aid-jrs313>3.0.co;2-s\u003C\u002Fa>","10.1002\u002F(sici)1097-4555(199809)29:9\u003C851::aid-jrs313>3.0.co;2-s",{"id":497,"year":498,"html":499,"doi":500},348420,2002,"Majzlan, J., Navrotsky, A., Neil, J.M. (2002) Energetics of anhydrite, barite, celestine, and anglesite: a high-temperature and differential scanning calorimetry study. \u003Ci>Geochimica et Cosmochimica Acta\u003C\u002Fi>,  66 (10) 1839-1850 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.1016\u002Fs0016-7037(01)00881-x'>doi:10.1016\u002Fs0016-7037(01)00881-x\u003C\u002Fa>","10.1016\u002Fs0016-7037(01)00881-x",{"id":502,"year":503,"html":504,"doi":11},16771791,2003,"Anthony, John Williams, Bideaux, Richard A., Bladh, Kenneth W., Nichols, Monte C. (2003) \u003Ci>Handbook of Mineralogy\u003C\u002Fi> Vol. 5 - Borates, Carbonates, Sulfates. Mineral Data Publishing, Tucson, Arizona.",{"id":506,"year":503,"html":507,"doi":508},13845066,"Freyer, Daniela, Voigt, Wolfgang (2003) Crystallization and Phase Stability of CaSO4 and CaSO4- Based Salts. \u003Ci>Monatshefte für Chemie \u002F Chemical Monthly\u003C\u002Fi>,  134 (5). 693-719 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.1007\u002Fs00706-003-0590-3'>doi:10.1007\u002Fs00706-003-0590-3\u003C\u002Fa>","10.1007\u002Fs00706-003-0590-3",{"id":510,"year":511,"html":512,"doi":11},16100667,2005,"Zimbelman, D.R., Rye, R.O., Breit, G.N. (2005) Origin of secondary sulfate minerals on active andesitic stratovolcanoes. Chemical Geology: 215: 37:60.",{"id":514,"year":511,"html":515,"doi":11},16100668,"Walter, F. (2005) Anhydrit als Einschluß in alpinen Quarzen der Ostalpen. Carinthia II: 195.\u002F115., 85-96.",{"id":517,"year":511,"html":518,"doi":11},16962897,"(2005) Anhydrite. \u003Ci>Handbook of Mineralogy\u003C\u002Fi>. Mineralogical Society of America \u003Ca target='_blank' href='https:\u002F\u002Fwww.handbookofmineralogy.org\u002Fpdfs\u002Fanhydrite.pdf' class='refpdflink'>\u003C\u002Fa>",{"id":520,"year":521,"html":522,"doi":523},395626,2007,"Lane, M. D. (2007) Mid-infrared emission spectroscopy of sulfate and sulfate-bearing minerals. \u003Ci>American Mineralogist\u003C\u002Fi>,  92 (1) 1-18 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.2138\u002Fam.2007.2170'>doi:10.2138\u002Fam.2007.2170\u003C\u002Fa> \u003Ca target='_blank' href='https:\u002F\u002Frruff.info\u002Fdoclib\u002Fam\u002Fvol92\u002FAM92_1.pdf' class='refpdflink'>\u003C\u002Fa>","10.2138\u002Fam.2007.2170",{"id":525,"year":526,"html":527,"doi":11},16100670,2008,"Walter, F. (2008) Anhydrit in Quarzkristallen aus den Ostalpen. Schweizer Strahler: 3: 10-14.",{"id":529,"year":526,"html":530,"doi":531},4303544,"Christensen, Axel Nørlund, Olesen, Maja, Cerenius, Yngve, Jensen, Torben R. (2008) Formation and Transformation of Five Different Phases in the CaSO4−H2O System: Crystal Structure of the Subhydrate β-CaSO4·0.5H2O and Soluble Anhydrite CaSO4. \u003Ci>Chemistry of Materials\u003C\u002Fi>, 20. 2124-2132 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.1021\u002Fcm7027542'>doi:10.1021\u002Fcm7027542\u003C\u002Fa>","10.1021\u002Fcm7027542",{"id":533,"year":534,"html":535,"doi":536},298106,2014,"Ossorio, M., Van Driessche, A.E.S., Pérez, P., García-Ruiz, J.M. (2014) The gypsum–anhydrite paradox revisited. \u003Ci>Chemical Geology\u003C\u002Fi>,  386. 16-21 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.1016\u002Fj.chemgeo.2014.07.026'>doi:10.1016\u002Fj.chemgeo.2014.07.026\u003C\u002Fa>","10.1016\u002Fj.chemgeo.2014.07.026",[538,548,555,565,569,577,581,590,600,607,617,625,633,639,646,655,664,673,681,690,698,705,711,721,730,739],{"id":539,"source_url":540,"license_code":541,"credit_html":542,"title":543,"description":544,"author":545,"original_width":546,"original_height":547},1438,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=735644","Public domain","Alcinoe, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=735644\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Anhydrite HMNH1.jpg","\u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAnhydrite\" class=\"extiw\" title=\"en:Anhydrite\">Anhydrite\u003C\u002Fa> from Naica Mine, Chihuahua, Mexico. Exposed in the Harvard Museum of Natural History","Alcinoe",1323,1377,{"id":549,"source_url":550,"license_code":551,"credit_html":552,"title":7,"description":11,"author":11,"original_width":553,"original_height":554},29095,"https:\u002F\u002Fgeocollections.info\u002Ffile\u002F114960","CC BY 4.0","Photo: Unknown author — http:\u002F\u002Fcreativecommons.org\u002Flicenses\u002Fby\u002F4.0\u002F, courtesy of \u003Ca href=\"https:\u002F\u002Fgeocollections.info\u002Ffile\u002F114960\" rel=\"noopener\">Department of Geology, TalTech\u003C\u002Fa> via Europeana",1000,666,{"id":556,"source_url":557,"license_code":558,"credit_html":559,"title":560,"description":561,"author":562,"original_width":563,"original_height":564},1439,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10169366","CC BY-SA 3.0","Robert M. Lavinsky, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10169366\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Anhydrite-261625.jpg","\u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAnhydrite\" class=\"extiw\" title=\"en:Anhydrite\">Anhydrite\u003C\u002Fa>\n\u003Cdl>\u003Cdd>\u003Cdl>\u003Cdd>Locality: \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FNaica\" class=\"extiw\" title=\"en:Naica\">Naica\u003C\u002Fa>, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FSaucillo_(municipality)\" class=\"extiw\" title=\"en:Saucillo (municipality)\">Municipio de Saucillo\u003C\u002Fa>, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FChihuahua\" class=\"extiw\" title=\"en:Chihuahua\">Chihuahua\u003C\u002Fa>, Mexico (\u003Ca rel=\"nofollow\" class=\"external text\" href=\"http:\u002F\u002Fwww.mindat.org\u002Floc-2308.html\">Locality at mindat.org\u003C\u002Fa>)\u003C\u002Fdd>\n\u003Cdd>Size: 16.8 x 15.4 x 10.8 cm.\u003C\u002Fdd>\n\u003Cdd>Naica is known to have produced some outstanding anhydrite specimens and this is certainly one. Lustrous, translucent, pastel-blue blades with white tips in fan-like, parallel-growth clusters comprise this dramatic and superb large cabinet jackstraw piece. The fans are up to 10.5 cm long. One of the very best Naica anhydrites I have ever seen.\u003C\u002Fdd>\u003C\u002Fdl>\u003C\u002Fdd>\u003C\u002Fdl>","Robert M. Lavinsky",750,657,{"id":566,"source_url":567,"license_code":551,"credit_html":568,"title":7,"description":11,"author":11,"original_width":553,"original_height":554},29096,"https:\u002F\u002Fgeocollections.info\u002Ffile\u002F119971","Photo: Unknown author — http:\u002F\u002Fcreativecommons.org\u002Flicenses\u002Fby\u002F4.0\u002F, courtesy of \u003Ca href=\"https:\u002F\u002Fgeocollections.info\u002Ffile\u002F119971\" rel=\"noopener\">Department of Geology, TalTech\u003C\u002Fa> via Europeana",{"id":570,"source_url":571,"license_code":558,"credit_html":572,"title":573,"description":574,"author":562,"original_width":575,"original_height":576},1440,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10477379","Robert M. Lavinsky, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10477379\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Anhydrite-tuc1044e.jpg","\u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAnhydrite\" class=\"extiw\" title=\"en:Anhydrite\">Anhydrite\u003C\u002Fa>\n\u003Cdl>\u003Cdd>\u003Cdl>\u003Cdd>Locality: St Gotthard basis tunnel (north section), NEAT Construction site, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FSilenen\" class=\"extiw\" title=\"en:Silenen\">Amsteg\u003C\u002Fa>, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FReuss_(river)\" class=\"extiw\" title=\"en:Reuss (river)\">Reuss Valley\u003C\u002Fa>, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FUri\" class=\"extiw\" title=\"en:Uri\">Uri\u003C\u002Fa>, Switzerland (\u003Ca rel=\"nofollow\" class=\"external text\" href=\"http:\u002F\u002Fwww.mindat.org\u002Floc-66412.html\">Locality at mindat.org\u003C\u002Fa>)\u003C\u002Fdd>\n\u003Cdd>Size: miniature, 4.6 x 2.5 x 1.5 cm\n\u003Cdl>\u003Cdt>Anhydrite\u003C\u002Fdt>\u003C\u002Fdl>\u003C\u002Fdd>\n\u003Cdd>This specimen was one I acquired on a recent trip to Germany, from a collection. It was removed during the famous construction of the NEAT tunnel in St. Gotthard pass, and is a beautiful, totally gemmy and transparent, floater crystal cluster of anhydrite. This is similar to classic material first known in the 1800s, but seldom seen on the market. This tunnelling project hit a few pockets of large crystals, now highly treasured, of this rare Alpine classic. This particular crystal is large and robust, complete all around, and attractive due to its gemminess and the sparkling chlorite on some surfaces. In person, it has a pale lavender color, typical of the locality. Superb for size, aesthetics, and importance, I regard this as a highly significant Alpine specimen of some rarity\u003C\u002Fdd>\u003C\u002Fdl>\u003C\u002Fdd>\u003C\u002Fdl>",1203,1500,{"id":578,"source_url":579,"license_code":551,"credit_html":580,"title":7,"description":11,"author":11,"original_width":553,"original_height":554},29097,"https:\u002F\u002Fgeocollections.info\u002Ffile\u002F119887","Photo: Unknown author — http:\u002F\u002Fcreativecommons.org\u002Flicenses\u002Fby\u002F4.0\u002F, courtesy of \u003Ca href=\"https:\u002F\u002Fgeocollections.info\u002Ffile\u002F119887\" rel=\"noopener\">Department of Geology, TalTech\u003C\u002Fa> via Europeana",{"id":582,"source_url":583,"license_code":558,"credit_html":584,"title":585,"description":586,"author":587,"original_width":588,"original_height":589},1441,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10677051","Didier Descouens, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10677051\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Anhydrite Arnave.jpg","Anhydrite - Gypsum Quarry Arnave,  Tarascon-sur-Ariège, Ariège, Midi-Pyrénées  - Size 31x16x15 cm","Didier Descouens",4592,3056,{"id":591,"source_url":592,"license_code":593,"credit_html":594,"title":595,"description":596,"author":597,"original_width":598,"original_height":599},1442,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=15871234","CC BY 3.0","Rock Currier, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=15871234\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Anhydrite-217320.jpg","\u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAnhydrite\" class=\"extiw\" title=\"en:Anhydrite\">Anhydrite\u003C\u002Fa>\n\u003Cdl>\u003Cdd>\u003Cdl>\u003Cdd>Locality: Salt mine, Altaussee, Bad Aussee, Styria, Austria\u003C\u002Fdd>\n\u003Cdd>Anhydrite crystals. Specimen is from the collection of the Smithsonian Institute, Washington, DC. USA.#R13966. Scale at bottom of image is an inch with a rule at one cm.\u003C\u002Fdd>\u003C\u002Fdl>\u003C\u002Fdd>\u003C\u002Fdl>","Rock Currier",1024,882,{"id":601,"source_url":602,"license_code":593,"credit_html":603,"title":604,"description":605,"author":597,"original_width":606,"original_height":598},1443,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=15871387","Rock Currier, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=15871387\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Anhydrite-217328.jpg","\u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAnhydrite\" class=\"extiw\" title=\"en:Anhydrite\">Anhydrite\u003C\u002Fa>\n\u003Cdl>\u003Cdd>\u003Cdl>\u003Cdd>Locality: Simplon Railway tunnel (north section), Simplon pass area, Brig, Wallis (Valais), Switzerland\u003C\u002Fdd>\n\u003Cdd>Anhydrite crystals. Specimen is from the George Vaux collection #8346, Bryn Marw College, Bryn Mawr, Pennsylvania, USA.\u003C\u002Fdd>\u003C\u002Fdl>\u003C\u002Fdd>\u003C\u002Fdl>",687,{"id":608,"source_url":609,"license_code":610,"credit_html":611,"title":612,"description":613,"author":614,"original_width":615,"original_height":616},1445,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=46337147","CC BY-SA 4.0","Unknown photographer, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=46337147\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Anhydrite from Sulitjelma.jpg","Mineral (Betegnelse)\n\u003Cp>Anhydritt (Presisert betegnelse)\nFunnsted: Norge, Nordland, Fauske, Sulitjelma\n\u003C\u002Fp>\nInventarnr.: BVM-M 0000127","Unknown photographer",1200,800,{"id":618,"source_url":619,"license_code":558,"credit_html":620,"title":621,"description":622,"author":562,"original_width":623,"original_height":624},36741,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10170319","Robert M. Lavinsky, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10170319\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Anhydrite-266467.jpg","\u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAnhydrite\" class=\"extiw\" title=\"en:Anhydrite\">Anhydrite\u003C\u002Fa>\n\u003Cdl>\u003Cdd>\u003Cdl>\u003Cdd>Locality: \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FNaica\" class=\"extiw\" title=\"en:Naica\">Naica\u003C\u002Fa>, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FSaucillo_(municipality)\" class=\"extiw\" title=\"en:Saucillo (municipality)\">Municipio de Saucillo\u003C\u002Fa>, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FChihuahua\" class=\"extiw\" title=\"en:Chihuahua\">Chihuahua\u003C\u002Fa>, Mexico (\u003Ca rel=\"nofollow\" class=\"external text\" href=\"http:\u002F\u002Fwww.mindat.org\u002Floc-2308.html\">Locality at mindat.org\u003C\u002Fa>)\u003C\u002Fdd>\n\u003Cdd>Size: 8.4 x 8.9 x 4.4 cm.\u003C\u002Fdd>\n\u003Cdd>Naica is known to have produced some outstanding anhydrite specimens and this is an excellent example. This is a complete-all-around and nearly pristine cluster of parallel-growth, translucent blades with pretty light, ice-blue color. Classic, highly representative material for the species and famed locale.\u003C\u002Fdd>\u003C\u002Fdl>\u003C\u002Fdd>\u003C\u002Fdl>",492,600,{"id":626,"source_url":627,"license_code":558,"credit_html":628,"title":629,"description":630,"author":562,"original_width":631,"original_height":632},36742,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10447531","Robert M. Lavinsky, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10447531\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Anhydrite-ea7c.jpg","\u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAnhydrite\" class=\"extiw\" title=\"en:Anhydrite\">Anhydrite\u003C\u002Fa>\n\u003Cdl>\u003Cdd>\u003Cdl>\u003Cdd>Locality: Simplon Railway tunnel (north section), Simplon pass area, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FBrig\" class=\"extiw\" title=\"en:Brig\">Brig\u003C\u002Fa>, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FWallis\" class=\"extiw\" title=\"en:Wallis\">Wallis (Valais)\u003C\u002Fa>, Switzerland (\u003Ca rel=\"nofollow\" class=\"external text\" href=\"http:\u002F\u002Fwww.mindat.org\u002Floc-3221.html\">Locality at mindat.org\u003C\u002Fa>)\u003C\u002Fdd>\n\u003Cdd>Size: miniature, 5.5 x 5 x 0.8 cm\n\u003Cdl>\u003Cdt>Anhydrite (floater and twinned)\u003C\u002Fdt>\u003C\u002Fdl>\u003C\u002Fdd>\n\u003Cdd>Incredible old classic from this famous tunnel project, and one of only a very few of such calibre in private hands! T his is a beautiful, complete floater. It is sharply twinned. It has wonderful , rich lavender color in person! Repaired, very cleanly. More on the site can be found here:\u003C\u002Fdd>\u003C\u002Fdl>\u003C\u002Fdd>\u003C\u002Fdl>\nWith a label from 1924.",400,361,{"id":634,"source_url":635,"license_code":558,"credit_html":636,"title":637,"description":574,"author":562,"original_width":638,"original_height":319},36745,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10477377","Robert M. Lavinsky, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10477377\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Anhydrite-tuc1044d.jpg",1020,{"id":640,"source_url":641,"license_code":593,"credit_html":642,"title":643,"description":644,"author":597,"original_width":598,"original_height":645},36746,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=14828474","Rock Currier, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=14828474\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Anhydrite-217327.jpg","\u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAnhydrite\" class=\"extiw\" title=\"en:Anhydrite\">Anhydrite\u003C\u002Fa>\n\u003Cdl>\u003Cdd>\u003Cdl>\u003Cdd>Locality: Simplon Railway tunnel (north section), Simplon pass area, Brig, Wallis (Valais), Switzerland\u003C\u002Fdd>\n\u003Cdd>Anhydrite crystals on matrix. Specimen is from the collection of Bill Pinch, 1980. Scale at bottom of image is an inch with a rule at one cm.\u003C\u002Fdd>\u003C\u002Fdl>\u003C\u002Fdd>\u003C\u002Fdl>",635,{"id":647,"source_url":648,"license_code":610,"credit_html":649,"title":650,"description":651,"author":652,"original_width":653,"original_height":654},36748,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=46081185","Hans-Joachim Engelhardt, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=46081185\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","(2015-12-19) ANHYDRIT 07 PWA-S.jpg","Teil einer Anhydritrosette (radialstrahliges Anhydritaggregat) mit einzelnen Gipskristallen aus dem Hauptanhydrit (Zechstein, Perm). Die Aufnahme zeigt Vergipsung des Anhydritgesteins. Mikroskopische Analyse eines Dünnschliffes mit einem Leitz Laborlux 12 POL-Mikroskop (gekreuzte Polarisatoren). NPL Fluotar 40\u002F0.70-Objektiv. Polarisationsfarben von Anhydrit (bunt) und Gips (unterschiedliche Graustufen). Aufgrund der geringen Schärfentiefe wurden mehrere Fotos mittels Focusstacking miteinander verrechnet.","Hans-Joachim Engelhardt",5184,3456,{"id":656,"source_url":657,"license_code":610,"credit_html":658,"title":659,"description":660,"author":661,"original_width":662,"original_height":663},36749,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=82980403","Mai Seppel, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=82980403\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Estonian Museum of Natural History Specimen No 202180 photo (g27 g27-519 1 jpg).jpg","\"anhüdriit\". More info \u003Ca rel=\"nofollow\" class=\"external text\" href=\"http:\u002F\u002Fgeocollections.info\u002Ffile\u002F65255\">about this file\u003C\u002Fa> and \u003Ca rel=\"nofollow\" class=\"external text\" href=\"http:\u002F\u002Fgeocollections.info\u002Fspecimen\u002F202180\">about this specimen\u003C\u002Fa> at \u003Ca rel=\"nofollow\" class=\"external text\" href=\"http:\u002F\u002Fgeocollections.info\u002F\">geocollections.info\u003C\u002Fa>","Mai Seppel",3031,2343,{"id":665,"source_url":666,"license_code":610,"credit_html":667,"title":668,"description":669,"author":670,"original_width":671,"original_height":672},36750,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=83000805","Tõnis Saadre, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=83000805\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Estonian Museum of Natural History Specimen No 194965 photo (g42 g42-33 jpg).jpg","\"anhüdriit\", \"anhüdriit\". More info \u003Ca rel=\"nofollow\" class=\"external text\" href=\"http:\u002F\u002Fgeocollections.info\u002Ffile\u002F90796\">about this file\u003C\u002Fa> and \u003Ca rel=\"nofollow\" class=\"external text\" href=\"http:\u002F\u002Fgeocollections.info\u002Fspecimen\u002F194965\">about this specimen\u003C\u002Fa> at \u003Ca rel=\"nofollow\" class=\"external text\" href=\"http:\u002F\u002Fgeocollections.info\u002F\">geocollections.info\u003C\u002Fa>","Tõnis Saadre",3760,1745,{"id":674,"source_url":675,"license_code":610,"credit_html":676,"title":677,"description":678,"author":670,"original_width":679,"original_height":680},36751,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=83017026","Tõnis Saadre, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=83017026\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Estonian Museum of Natural History Specimen No 194990 photo (g42 g42-58 1 jpg).jpg","\"anhüdriit\", \"anhüdriit\". More info \u003Ca rel=\"nofollow\" class=\"external text\" href=\"http:\u002F\u002Fgeocollections.info\u002Ffile\u002F90762\">about this file\u003C\u002Fa> and \u003Ca rel=\"nofollow\" class=\"external text\" href=\"http:\u002F\u002Fgeocollections.info\u002Fspecimen\u002F194990\">about this specimen\u003C\u002Fa> at \u003Ca rel=\"nofollow\" class=\"external text\" href=\"http:\u002F\u002Fgeocollections.info\u002F\">geocollections.info\u003C\u002Fa>",3616,3220,{"id":682,"source_url":683,"license_code":551,"credit_html":684,"title":685,"description":686,"author":687,"original_width":688,"original_height":689},36754,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=147616212","Miguel Calvo, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=147616212\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Anhidrita Remolinos 2.jpg","Microcrystalline anhydrite nodule. These nodules are trapped within layers of salt. Remolinos salt mines (Zaragoza). Size, 6 cm. Collection and photo Miguel Calvo.","Miguel Calvo",5432,4002,{"id":691,"source_url":692,"license_code":558,"credit_html":693,"title":694,"description":695,"author":696,"original_width":624,"original_height":697},12011,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=15374192","Thomas Witzke, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=15374192\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Ye'elimite, Hydroxylellestadite, Anhydrite - Ronneburg, Thuringia.jpg","\u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FYe%27elimite\" class=\"extiw\" title=\"en:Ye'elimite\">Ye'elimite\u003C\u002Fa> (white) intergrown with \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FHydroxylellestadite\" class=\"extiw\" title=\"en:Hydroxylellestadite\">Hydroxylellestadite\u003C\u002Fa> (reddish-brown) in grey \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAnhydrite\" class=\"extiw\" title=\"en:Anhydrite\">Anhydrite\u003C\u002Fa> (Picture size 6 mm)\n\u003Cdl>\u003Cdd>\u003Cdl>\u003Cdd>Locality: Ronneburg, Thuringia, Germany\u003C\u002Fdd>\u003C\u002Fdl>\u003C\u002Fdd>\u003C\u002Fdl>","Thomas Witzke",450,{"id":699,"source_url":700,"license_code":558,"credit_html":701,"title":702,"description":703,"author":562,"original_width":624,"original_height":704},36739,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10146457","Robert M. Lavinsky, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10146457\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Anhydrite-Calcite-154693.jpg","\u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAnhydrite\" class=\"extiw\" title=\"en:Anhydrite\">Anhydrite\u003C\u002Fa>, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FCalcite\" class=\"extiw\" title=\"en:Calcite\">Calcite\u003C\u002Fa>\n\u003Cdl>\u003Cdd>\u003Cdl>\u003Cdd>Locality: \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FNaica\" class=\"extiw\" title=\"en:Naica\">Naica\u003C\u002Fa>, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FSaucillo_(municipality)\" class=\"extiw\" title=\"en:Saucillo (municipality)\">Municipio de Saucillo\u003C\u002Fa>, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FChihuahua\" class=\"extiw\" title=\"en:Chihuahua\">Chihuahua\u003C\u002Fa>, Mexico (\u003Ca rel=\"nofollow\" class=\"external text\" href=\"http:\u002F\u002Fwww.mindat.org\u002Floc-2308.html\">Locality at mindat.org\u003C\u002Fa>)\u003C\u002Fdd>\n\u003Cdd>Size: 8.4 x 5.9 x 4.7 cm, 4.4 x 4.4 x 1.5 cm.\u003C\u002Fdd>\n\u003Cdd>Two specimens of very pale sky-blue-grey blades of anhydrite, decorated with spiky, translucent calcite twins - beautiful combo and classic from Naica! Ex. Ydren Collection.\u003C\u002Fdd>\u003C\u002Fdl>\u003C\u002Fdd>\u003C\u002Fdl>",338,{"id":706,"source_url":707,"license_code":558,"credit_html":708,"title":709,"description":710,"author":562,"original_width":563,"original_height":554},36740,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10167454","Robert M. Lavinsky, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=10167454\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Quartz-Anhydrite-251140.jpg","\u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FQuartz\" class=\"extiw\" title=\"en:Quartz\">Quartz\u003C\u002Fa>, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAnhydrite\" class=\"extiw\" title=\"en:Anhydrite\">Anhydrite\u003C\u002Fa>\n\u003Cdl>\u003Cdd>\u003Cdl>\u003Cdd>Locality: Cunningham Gulch, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FSilverton\" class=\"extiw\" title=\"en:Silverton\">Silverton\u003C\u002Fa>, Silverton District, San Juan County, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FColorado\" class=\"extiw\" title=\"en:Colorado\">Colorado\u003C\u002Fa>, USA (\u003Ca rel=\"nofollow\" class=\"external text\" href=\"http:\u002F\u002Fwww.mindat.org\u002Floc-31831.html\">Locality at mindat.org\u003C\u002Fa>)\u003C\u002Fdd>\n\u003Cdd>Size: 7.0 x 4.8 x 4.0 cm.\u003C\u002Fdd>\n\u003Cdd>An unusual, rare and excellent Colorado pseudomorph. These specimens have been labeled as being quartz after baryte pseudomorphs, but given the fact that baryte is chemically inert and nearly impossible to dissolve, it is most likely that these pseudomorphs are quartz replacing anhydrite. With that said, this superb plate consists of textbook pseudomorphs showing the perfect orthorhombic, thin bladed form of the previous crystal which was replaced by very small, almost \"sugary\" white quartz crystals. Ex. Stoudt Collection.\u003C\u002Fdd>\u003C\u002Fdl>\u003C\u002Fdd>\u003C\u002Fdl>",{"id":712,"source_url":713,"license_code":714,"credit_html":715,"title":716,"description":717,"author":718,"original_width":719,"original_height":720},36752,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=84690168","CC BY 2.0","James St. John, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=84690168\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Rock anhydrite (St. Louis Limestone, Middle Mississippian; subsurface gypsum mine in Martin County, Indiana, USA) (30048366846).jpg","\u003Cp>Rock anhydrite from the Mississippian of Indiana, USA. (Indiana State Museum collection)\n\u003C\u002Fp>\u003Cp>Rock anhydrite is an uncommon, crystalline-textured, ~monomineralic, chemical sedimentary rock.  It is composed of the mineral anhydrite (CaSO4 - calcium sulfate), which is gypsum withouth the water (gypsum is hydrous calcium sulfate - CaSO4·2H2O).  Rock anhydrite has the same origin as rock salt (halitite) and rock gypsum (gyprock) - they are all evaporites, formed by the evaporation of water (usually seawater) and the precipitation of dissolved minerals.\n\u003C\u002Fp>\u003Cp>Rock anhydrite is prone to conversion to rock gypsum, and vice versa.  Rock anhdyrite to rock gypsum transformations occur commonly in nature - the accompanying volume changes often result in significant deformation of surrounding rocks.\n\u003C\u002Fp>\u003Cp>Stratigraphy: St. Louis Limestone, Meramecian Stage, Middle Mississippian\n\u003C\u002Fp>\nLocality: subsurface gypsum mine in Martin County, southwestern Indiana, USA","James St. John",1678,3131,{"id":722,"source_url":723,"license_code":610,"credit_html":724,"title":725,"description":726,"author":727,"original_width":728,"original_height":729},51783,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=130248223","Raimond Spekking, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=130248223\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Danburite. Werra-Anhydrit, Germany-9150.jpg","\u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FDanburite\" class=\"extiw\" title=\"en:Danburite\">Danburite\u003C\u002Fa> (Weight: 29.7 g) – Place of discovery: Werra-Anhydrit, Kyffhäuser Mountains, Thuringia, Germany","Raimond Spekking",5799,4179,{"id":731,"source_url":732,"license_code":551,"credit_html":733,"title":734,"description":735,"author":736,"original_width":737,"original_height":738},62851,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=182409086","Luki exe13, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=182409086\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Ftalimid.jpg","Phthalimide prepared by Phthalimide condensation of Urea and Phthalic Anhydride in 140 degrees C.","Luki exe13",3000,3750,{"id":740,"source_url":741,"license_code":558,"credit_html":742,"title":743,"description":744,"author":745,"original_width":746,"original_height":747},74867,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=8916330","Andrey Butko, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=8916330\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","History museum of Truskavets 081.jpg","History museum of Truskavets - \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FAnhydrite\" class=\"extiw\" title=\"en:Anhydrite\">Anhydrite\u003C\u002Fa> and \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FPolyhalite\" class=\"extiw\" title=\"en:Polyhalite\">Polyhalite\u003C\u002Fa>","Andrey Butko",2048,1536,[749,756,761,766,771],{"id":750,"url":751,"label":752,"formula":753,"spacegroup":754,"year":755},599,"\u002Fcif\u002F599.cif","Xu 2017","Ca S O4","B m m b",2017,{"id":624,"url":757,"label":758,"formula":753,"spacegroup":759,"year":760},"\u002Fcif\u002F600.cif","Antao 2011","A m m a",2011,{"id":762,"url":763,"label":764,"formula":753,"spacegroup":765,"year":511},603,"\u002Fcif\u002F603.cif","Crichton 2005 · Ca S O4 (1)","P 1 21\u002Fn 1",{"id":767,"url":768,"label":769,"formula":753,"spacegroup":770,"year":511},604,"\u002Fcif\u002F604.cif","Crichton 2005 · Ca S O4 (2)","P b n m",{"id":772,"url":773,"label":774,"formula":753,"spacegroup":775,"year":776},605,"\u002Fcif\u002F605.cif","Bezou 1995","C 2 2 2",1995,[778,779,780,781,782,783,784,785,786,787,788,789,790,791,792,793,794,795,796,797,798,799,800,801,802],"Anchydrit","Anhydrita","Anhydrous Gypsum","Anhydrous Sulfate of Lime","Anidrit","Bardiglione","Chaux sulfatée anhydre","Chaux sulfatée quartzifère","Cube Spar","Gekrösstein","Karstenit","Karstenite","Leuchtstein","Marmor Bardiglio di Bergamo","Metanhydrit","Muriacit","Muriacita","Muriacite","Muriazit","Salzsaurer Kalk","Siliceous Anhydrous Gypsum","Soude muriatée gypsifère","Würfelgips","Würfelgyps","Würfelspat",[804,808,812,816,820,823,826,831,835,840,844,850,854,857,861,865,869,873,879,882,887,891,895,899,902,907,912,915,919,922,925,928,932,935,939,942,945,949,953,957,960,964,967,971,974,978,983,987,991,994,997,1000,1003,1007,1010,1013,1016,1020,1023,1027,1031,1035,1038,1041,1044,1047,1050,1053],{"lang":805,"names":806},"ar",[807],"أنهيدريت",{"lang":809,"names":810},"az",[811],"Anhidrit",{"lang":813,"names":814},"ba",[815],"Ангидрит",{"lang":817,"names":818},"be",[819],"Ангідрыт",{"lang":821,"names":822},"be-tarask",[819],{"lang":824,"names":825},"be-x-old",[819],{"lang":827,"names":828},"bg",[829,830],"Анхидрид","Анхидриди",{"lang":832,"names":833},"bn",[834],"অ্যানহাইড্রাইট",{"lang":836,"names":837},"ca",[838,839],"anhidrita","vulpinita",{"lang":841,"names":842},"cs",[843],"Anhydrit",{"lang":845,"names":846},"de",[843,847,848,849,787,788],"Anhydritbinder","Anhydritspat","Anhydritstein",{"lang":851,"names":852},"eo",[853],"Anhidrito",{"lang":855,"names":856},"es",[838],{"lang":858,"names":859},"et",[860],"anhüdriit",{"lang":862,"names":863},"eu",[864],"Anhidrita",{"lang":866,"names":867},"fa",[868],"انیدریت",{"lang":870,"names":871},"fi",[872],"Anhydriitti",{"lang":874,"names":875},"fr",[876,7,784,785,877,795,878,799,106],"7778-18-9","Karsténite","Pierre 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name tells you what is missing. **Anhydrite** comes from the Greek *anhydros* — without water — and that absence is the whole point[1]. It is calcium sulfate with no water built into its crystals, the dry counterpart of gypsum, which carries water in its structure.\n\nA first specimen turned up in 1794, in a salt mine near Hall in Tirol, in the Austrian Alps[2]. The mineral was not named, though, until 1804. In that year the German geologist Abraham Gottlob Werner gave it the name anhydrite, chosen precisely to set it apart from gypsum[1]. Werner saw that the two minerals were close cousins — both calcium sulfate — but that one had taken on water and one had not.\n\nThat difference is not just a label. Left in contact with water, anhydrite slowly absorbs it and turns into gypsum, swelling as it does so[3]. The change can be undone by heat, driving the water back off above about 200 °C[3]. The mineral was even made artificially this way, crystallised from salty solutions kept warm[4].\n\nAnhydrite also lent its name to an industrial recipe. Between 1930 and 1976, three plants in Britain — and others in Germany, France, Austria, and Poland — ran the so-called anhydrite process, baking the mineral in a kiln to make sulfuric acid and cement at the same time[5]. One relic survives as a carved relief of an anhydrite kiln, cut from a block of the mineral itself for a sulphuric acid company[6].\n\nThe water-swapping habit took a destructive turn later. In the German town of Staufen im Breisgau, a 2007 geothermal drilling project let underground water reach a buried layer of anhydrite[7]. As pockets of it converted to gypsum and expanded, the ground heaved unevenly and cracked buildings across the old town[7].","claude-opus-4-8","1.7.0",{"markdown":1063,"model_version":1060,"prompt_version":1061,"reviewed_at":11},"Pour a level floor and you may be standing on anhydrite. Ground to a powder and mixed with water, it sets back into a hard mass — the reverse of the slow weathering it undergoes in the ground. That single trick makes it a useful building material rather than a museum curiosity.\n\nThe largest use today is in flooring. Anhydrite is the binder in self-levelling floor screeds — the liquid layer poured over a sub-floor to smooth and flatten it before tiles or boards go down. Builders favour it for its better fluidity for self-levelling, its dimensional stability, and a high mechanical strength once cured[1]. It also conducts heat well, which suits it to floors with heating pipes buried inside[1].\n\nIt plays a quieter part in cement. Added to the mix, anhydrite acts as a set time controller — slowing or tuning how fast the cement hardens — while also raising mechanical strength and curbing shrinkage as the concrete dries[2]. It is also added to plasters and cement as a drying agent, drawing in stray moisture[3].\n\nAnhydrite is calcium sulfate, so it carries two things plants want: calcium and sulfur. Crushed and spread on fields, it feeds both as fertilising elements, and it can double as a cheap mineral filler in fertiliser blends[4].\n\nTwo further uses turn on its chemistry. It is mixed into aerated building blocks, where it reacts with aluminium powder to release the gas that froths the block full of bubbles[5]. And it is used to neutralise polluted soil, locking up contaminants so they spread no further[6]."]