[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"minerals:one:3440":3},{"id":4,"longid":5,"guid":6,"name":7,"shortcode_ima":8,"entrytype":9,"entrytype_text":10,"varietyof":11,"synid":11,"polytypeof":11,"groupid":11,"weighting":12,"nolocadd":13,"blacklisted":13,"mindat_formula":14,"mindat_formula_note":11,"ima_formula":15,"elements":16,"sigelements":21,"key_elements":22,"impurities":23,"cim":24,"ima_status":25,"ima_notes":11,"ima_history":11,"approval_year":11,"publication_year":27,"discovery_year":11,"strunz10ed1":28,"strunz10ed2":29,"strunz10ed3":29,"strunz10ed4":30,"dana8ed1":31,"dana8ed2":32,"dana8ed3":33,"dana8ed4":34,"csystem":35,"cclass":11,"spacegroup":11,"spacegroupset":36,"a":37,"b":38,"c":39,"alpha":36,"beta":40,"gamma":36,"aerror":41,"berror":42,"cerror":41,"alphaerror":11,"betaerror":42,"gammaerror":11,"va3":11,"z":42,"csmetamict":13,"commentcrystal":43,"twinning":44,"tranglide":11,"parting":11,"epitaxidescription":11,"morphology":11,"tlform":45,"hmin":11,"hmax":11,"hardtype":11,"vhnmin":36,"vhnmax":36,"vhnerror":11,"vhng":11,"vhns":11,"commenthard":46,"dmeas":47,"dmeas2":47,"dcalc":47,"dmeaserror":11,"dcalcerror":11,"commentdense":11,"lustre":11,"lustretype":11,"commentluster":11,"diapheny":48,"streak":11,"colour":49,"commentcolor":50,"colors":51,"streak_colors":11,"luminescence":11,"uv":11,"cleavage":54,"cleavagetype":55,"fracturetype":11,"tenacity":56,"commentbreak":11,"opticaltype":57,"opticalsign":58,"opticalalpha":59,"opticalalpha2":36,"opticalalphaerror":11,"opticalbeta":60,"opticalbeta2":36,"opticalbetaerror":11,"opticalgamma":61,"opticalgamma2":36,"opticalgammaerror":11,"opticalomega":36,"opticalomega2":36,"opticalomegaerror":11,"opticalepsilon":36,"opticalepsilon2":36,"opticalepsilonerror":11,"opticaln":36,"opticaln2":36,"opticalnerror":11,"optical2vcalc":62,"optical2vcalc2":36,"optical2vcalcerror":11,"optical2vmeasured":63,"optical2vmeasured2":36,"optical2vmeasurederror":11,"rimin":64,"rimax":65,"opticaldispersion":66,"opticalpleochroism":11,"opticalpleochorismdesc":11,"opticalbirefringence":11,"opticalcomments":11,"opticalcolour":11,"opticalinternal":11,"opticaltropic":11,"opticalanisotropism":11,"opticalbireflectance":11,"opticalextinction":11,"opticalr":11,"specdispm":11,"ir":11,"electrical":11,"magnetism":11,"thermalbehaviour":11,"other":67,"industrial":11,"occurrence":68,"otheroccurrence":11,"type_specimen_store":69,"description_short":70,"aboutname":71,"rock_parent":11,"rock_parent2":11,"rock_root":9,"rock_bgs_code":11,"meteoritical_code":11,"updttime":72,"reviewed_at":11,"variety_of":11,"varieties":73,"group_members":74,"associates":75,"confused_with":76,"type_localities":77,"occurrence_total":89,"citations":90,"images":117,"structures":128,"synonyms":135,"language_names":138,"wikidata_qid":155,"texts":156},3440,"1:1:3440:7","a776c116-8bd0-48b8-9910-97807e19ec57","Rokühnite","Rok",0,"mineral",null,63,false,"FeCl\u003Csub>2\u003C\u002Fsub>·2H\u003Csub>2\u003C\u002Fsub>O","FeCl\u003Csub>2\u003C\u002Fsub> · 2H\u003Csub>2\u003C\u002Fsub>O",[17,18,19,20],"Cl","Fe","O","H",[17,18,19,20],[17],"Mg","8.11.3",[26],"APPROVED",1980,"3","B","10","9","2","4","1","Monoclinic","0","7.396","8.458","3.638","97.68",1,2,"space group C2\u002Fm, C2 or Cm","Contact, on \u003Cmi>{_201}\u003C\u002Fmi>.","Rare thin plates, commonly comprising fibers, with dominating {110} form and a number of other forms present, up to 300 µm.","not determined","2.35","Transparent","Colourless (transmitted light), light green","Brown when oxidized.",[52,53],"colorless","green","{100}; also good on {010}","Very Good","flexible","Biaxial","+","1.605","1.633","1.702","68","64",1.605,1.702,"strong (r ≤ v)","Water-soluble; topotactical hydration and rapid oxidation in air.","Secondary, in fissures within earlier K-rich salt beds.","University of Hannover, Hannover, Germany (cotype).\r\nMineralogisch-Petrographisches Institut, Heidelberg, Germany (cotype).\r\nMineralogische Sammlungen, Mineralogisch-Petrographisches Institut, Universität Göttingen, Göttingen, Germany, number GZG.MIN.3.1.31.1 (type).","The hydrated counterpart of lawrencite. Other approved ferrous-iron-bearing chlorides include droninoite and hibbingite. Compare the hydrated ferric-iron chloride minerals: 'hydromolysite', 'Unnamed (Fe Chloride Hydrate I)', and 'Unnamed (Fe Chloride H...","Named after Robert Kühn (1911–2000), German mineralogist, and professor at Kaliforschungs-Institut der Kali und Salz AG, Hannover, Germany.","2025-08-11 12:14:23",[],[],[],[],[78,84],{"id":79,"txt":80,"latitude":81,"longitude":82,"country":83},13519,"Salzdetfurth Potash Works, Bad Salzdetfurth, Hildesheim District, Lower Saxony, Germany",52.061803,9.998581,"Germany",{"id":85,"txt":86,"latitude":87,"longitude":88,"country":83},15734,"Siegfried-Giesen Potash Works, Giesen, Hildesheim District, Lower Saxony, Germany",52.2041877,9.8816869,6,[91,95,99,102,105,109,113],{"id":92,"year":93,"html":94,"doi":11},16122084,1965,"Morosin, B., Graeber, E.J. (1965) Crystal Structures of Manganese(II) and Iron(II) Chloride Dihydrate. Journal of Chemical Physics, 42, 898-901.",{"id":96,"year":97,"html":98,"doi":11},16122085,1976,"Schneider, W., Weitzel, H. (1976) Bestimmung der magnetischen phasen von eisen(II)-chlorid-doppelhydrat, FeCl2·2H2O, und kobalt(II)-chlorid-doppelhydrat, CoCl2·2H2O, mit neutronenbeugung. Acta Crystallographica, A32, 32-37.",{"id":100,"year":27,"html":101,"doi":11},16122086,"von Hodenberg, R., von Struensee, G. (1980) Rokühnite, FeCl\u003Csub>2\u003C\u002Fsub>•2H\u003Csub>2\u003C\u002Fsub>O, a new mineral. Neues Jahrbuch für Mineralogie, Monatshefte: 125-130.",{"id":103,"year":27,"html":104,"doi":11},16122089,"von Hodenberg, R., von Struensee, G. (1980) Rokühnite, FeCl\u003Csub>2\u003C\u002Fsub>•2H\u003Csub>2\u003C\u002Fsub>O, a new mineral. Neues Jahrb. Mineral. Monatsh.: 125-130.",{"id":106,"year":107,"html":108,"doi":11},527572,1981,"Fleischer, Michael, Chao, George Y., Francis, Carl A., Pabst, and Adolf (1981) New Mineral Names. \u003Ci>American Mineralogist\u003C\u002Fi>,  66 (1-2) 217-220 \u003Ca target='_blank' href='http:\u002F\u002Fwww.minsocam.org\u002Fammin\u002FAM66\u002FAM66_217.pdf' class='refpdflink'>\u003C\u002Fa>",{"id":110,"year":111,"html":112,"doi":11},16967031,2005,"(2005) Rokühnite. \u003Ci>Handbook of Mineralogy\u003C\u002Fi>. Mineralogical Society of America \u003Ca target='_blank' href='https:\u002F\u002Fwww.handbookofmineralogy.org\u002Fpdfs\u002Frokuhnite.pdf' class='refpdflink'>\u003C\u002Fa>",{"id":114,"year":115,"html":116,"doi":11},16100989,2016,"Anthony, John W., Bideaux, Richard A., Bladh, Kenneth W., Nichols, Monte C. - \u003Ci>Eds.\u003C\u002Fi> (2016) Handbook of Mineralogy. \u003Ca target='_blank' rel='nofollow' href='https:\u002F\u002Fwww.handbookofmineralogy.org\u002F'>https:\u002F\u002Fwww.handbookofmineralogy.org\u002F\u003C\u002Fa>",[118],{"id":119,"source_url":120,"license_code":121,"credit_html":122,"title":123,"description":124,"author":125,"original_width":126,"original_height":127},21068,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=127445213","CC BY-SA 4.0","David Hospital, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=127445213\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Rokühnite.jpg","Yellow brown partially melted crystal of the very rare Fe chloride mineral rokühnite from the type locality in Hildesheim, Germany (Hildesheim, Lower Saxony, Germany). Analyzed specimen by SEM\u002FEDS. The mineral species is very higroscopic, from Mindat:  water-soluble; topotactical hydration and rapid oxidation in air.  okuhnite is described as light green, but rapidly oxidizes and turns brown when exposed to air and moisture. Ex Vandenbroucke Museum collection from Waregem, Belgium.","David Hospital",774,592,[129],{"id":130,"url":131,"label":132,"formula":133,"spacegroup":134,"year":93},12243,"\u002Fcif\u002F12243.cif","Morosin 1965","Fe Cl2 O2 H4","C 1 2\u002Fm 1",[136,137],"IMA1979-036","Rokühniet",[139,143,148,152],{"lang":140,"names":141},"ca",[142],"rokühnita",{"lang":144,"names":145},"de",[146,147],"IMA 1979-036","Rokühnit",{"lang":149,"names":150},"eu",[151],"Rokühnita",{"lang":153,"names":154},"it",[7],"Q3940226",{"history":11,"applications":11}]