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Point Group: 4\u002Fm 2\u002Fm 2\u002Fm ;Space Group: P4\u002Fnmm.","Granular masses and blebs",2.5,"27","31",25,"7.6","7.8","7.91","Metallic","Opaque","Shining","Brilliant creamy white","Tarnishes to bright orange",[54],"white","Irregular\u002FUneven,Conchoidal","brittle","Somewhat sectile","Weak","Tin-white with faint creamy tinge","Anisotropic","Strong olive-brown to steel-blue with a purplish tinge","Hydrothermal deposits","For the Greek for opportunity, since it was first found shortly after the description of selenium.","2026-03-12 17:19:04",[],[],[68,77,87,95,101,110,119,128,133,140,147],{"id":69,"name":70,"entrytype":9,"csystem":71,"ima_formula":72,"mindat_formula":72,"hmin":73,"hmax":73,"dmeas":74,"dcalc":75,"primary_image_id":76},645,"Berzelianite","Isometric","Cu\u003Csub>2-x\u003C\u002Fsub>Se (x ≈ 0.12)",2,"6.71","7.28",3181,{"id":78,"name":79,"entrytype":9,"csystem":80,"ima_formula":81,"mindat_formula":82,"hmin":83,"hmax":83,"dmeas":84,"dcalc":85,"primary_image_id":86},859,"Calcite","Trigonal","Ca(CO\u003Csub>3\u003C\u002Fsub>)","CaCO\u003Csub>3\u003C\u002Fsub>",3,"2.7102","2.711",4401,{"id":88,"name":89,"entrytype":9,"csystem":33,"ima_formula":90,"mindat_formula":91,"hmin":73,"hmax":41,"dmeas":92,"dcalc":93,"primary_image_id":94},949,"Chalcomenite","Cu(Se\u003Csup>4+\u003C\u002Fsup>O\u003Csub>3\u003C\u002Fsub>) · 2H\u003Csub>2\u003C\u002Fsub>O","CuSeO\u003Csub>3\u003C\u002Fsub>·2H\u003Csub>2\u003C\u002Fsub>O","3.35","3.4",5184,{"id":96,"name":97,"entrytype":9,"csystem":71,"ima_formula":98,"mindat_formula":98,"hmin":41,"hmax":83,"dmeas":46,"dcalc":99,"primary_image_id":100},1061,"Clausthalite","PbSe","8.275",29490,{"id":102,"name":103,"entrytype":9,"csystem":104,"ima_formula":105,"mindat_formula":106,"hmin":41,"hmax":83,"dmeas":107,"dcalc":108,"primary_image_id":109},1159,"Crookesite","Tetragonal","Cu\u003Csub>7\u003C\u002Fsub>TlSe\u003Csub>4\u003C\u002Fsub>","Cu\u003Csub>7\u003C\u002Fsub>(Tl, Ag)Se\u003Csub>4\u003C\u002Fsub>","6.90","7.443",6485,{"id":111,"name":112,"entrytype":9,"csystem":113,"ima_formula":114,"mindat_formula":115,"hmin":73,"hmax":41,"dmeas":116,"dcalc":117,"primary_image_id":118},2226,"Klockmannite","Hexagonal","Cu\u003Csub>5.2\u003C\u002Fsub>Se\u003Csub>6\u003C\u002Fsub>","CuSe","5.99","6.12",5188,{"id":120,"name":121,"entrytype":9,"csystem":122,"ima_formula":123,"mindat_formula":123,"hmin":124,"hmax":125,"dmeas":126,"dcalc":31,"primary_image_id":127},2550,"Malachite","Monoclinic","Cu\u003Csub>2\u003C\u002Fsub>(CO\u003Csub>3\u003C\u002Fsub>)(OH)\u003Csub>2\u003C\u002Fsub>",3.5,4,"3.6",30149,{"id":129,"name":130,"entrytype":9,"csystem":33,"ima_formula":131,"mindat_formula":131,"hmin":83,"hmax":83,"dmeas":34,"dcalc":132,"primary_image_id":11},3176,"Petrovicite","Cu\u003Csub>3\u003C\u002Fsub>HgPbBiSe\u003Csub>5\u003C\u002Fsub>","7.707",{"id":134,"name":135,"entrytype":9,"csystem":71,"ima_formula":136,"mindat_formula":136,"hmin":41,"hmax":41,"dmeas":137,"dcalc":138,"primary_image_id":139},3957,"Tiemannite","HgSe","8.19","8.239",24171,{"id":141,"name":142,"entrytype":9,"csystem":104,"ima_formula":143,"mindat_formula":143,"hmin":83,"hmax":83,"dmeas":144,"dcalc":145,"primary_image_id":146},4090,"Umangite","Cu\u003Csub>3\u003C\u002Fsub>Se\u003Csub>2\u003C\u002Fsub>","6.44","6.590",24964,{"id":148,"name":149,"entrytype":9,"csystem":113,"ima_formula":150,"mindat_formula":150,"hmin":83,"hmax":83,"dmeas":34,"dcalc":151,"primary_image_id":152},4263,"Weissite","Cu\u003Csub>2-x\u003C\u002Fsub>Te","5.83",12103,[],[155],{"id":156,"txt":157,"latitude":158,"longitude":159,"country":160},3161,"Skrikerum Mine, Valdemarsvik, Östergötland County, Sweden",58.1604618,16.4198728,"Sweden",57,[163,167,171,176,181],{"id":164,"year":165,"html":166,"doi":11},16108710,1818,"Berzelius, J. (1818) III. Undersökning af några föreningar, som bero af svagare frändskaper 12. Undersökning om fórekommandet af selenium i mineralriket. Afhandlingar i Fysik, Kemi och Mineralogi 6, 134-144.",{"id":168,"year":169,"html":170,"doi":11},1118651,1944,"Palache, Charles, Berman, Harry, Frondel, Clifford (1944) \u003Ci>The System of Mineralogy\u003C\u002Fi> (7th ed.) Vol. 1 - Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, New York.",{"id":172,"year":173,"html":174,"doi":175},7745441,1954,"Borchert, Werner; Patzak, Ingeborg (1954) Reaktionen im festen Zustand von Kupfer und Silber mit Selen. \u003Ci>Heidelberger Beiträge zur Mineralogie und Petrographie\u003C\u002Fi>,  4 (5). 434-442 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.1007\u002Fbf01136987'>doi:10.1007\u002Fbf01136987\u003C\u002Fa>","10.1007\u002Fbf01136987",{"id":177,"year":178,"html":179,"doi":180},106017,1957,"Frueh, A. J.; Czamanske, G. K.; Knight, Ch. (1957) The crystallography of eucairite, CuAgSe. \u003Ci>Zeitschrift für Kristallographie\u003C\u002Fi>,  108 (5-6). 389-396 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.1524\u002Fzkri.1957.108.5-6.389'>doi:10.1524\u002Fzkri.1957.108.5-6.389\u003C\u002Fa> \u003Ca target='_blank' href='https:\u002F\u002Frruff.info\u002Fdoclib\u002Fzk\u002Fvol108\u002FZK108_389.pdf?reftype=unknown' class='refpdflink'>\u003C\u002Fa>","10.1524\u002Fzkri.1957.108.5-6.389",{"id":182,"year":183,"html":184,"doi":11},16964167,2005,"(2005) Eucairite. \u003Ci>Handbook of Mineralogy\u003C\u002Fi>. Mineralogical Society of America \u003Ca target='_blank' href='https:\u002F\u002Fwww.handbookofmineralogy.org\u002Fpdfs\u002Feucairite.pdf' class='refpdflink'>\u003C\u002Fa>",[186,196,202,212],{"id":187,"source_url":188,"license_code":189,"credit_html":190,"title":191,"description":192,"author":193,"original_width":194,"original_height":195},8120,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=42474638","CC BY-SA 3.0","Robert M. Lavinsky, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=42474638\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Eucairite-561857.jpg","\u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FEucairite\" class=\"extiw\" title=\"en:Eucairite\">Eucairite\u003C\u002Fa>\n\u003Cdl>\u003Cdd>\u003Cdl>\u003Cdd>Locality: Cougar Mine (Cougar Ventures C-SR-15), Slick Rock District, San Miguel County, Colorado, USA\u003C\u002Fdd>\n\u003Cdd>Dimensions: 3.8 cm x 2 cm x 1.5 cm\u003C\u002Fdd>\n\u003Cdd>Eucairite is a rare Ag-Cu selenide, AgCuSe, and is found in hydrothermal deposits. Brilliant creamy white granular masses and blebs of eucairite are visible on the broken face of the half nodule. The green outer coating is an unknown mineral. Specimens of any species are rare from this abandoned uranium-vanadium mine. The Burminco label dates to the 1950s or 1960s. Ex. Smithsonian Collection and the numbers match.\u003C\u002Fdd>\u003C\u002Fdl>\u003C\u002Fdd>\u003C\u002Fdl>","Robert M. Lavinsky",465,327,{"id":197,"source_url":198,"license_code":189,"credit_html":199,"title":200,"description":192,"author":193,"original_width":194,"original_height":201},8121,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=43443230","Robert M. Lavinsky, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=43443230\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Eucairite-561856.jpg",207,{"id":203,"source_url":204,"license_code":205,"credit_html":206,"title":207,"description":208,"author":209,"original_width":210,"original_height":211},8122,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=97237536","CC BY-SA 4.0","David Hospital, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=97237536\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Eucairite-purpleSky.jpg","Black crystal aggregates of the very rare Ag-Cu selenide mineral eucairite from probably the type locality in Sweden (Skrikerum Mine, Valdemarsvik, Östergötland County, Sweden), eventhough the label states \"Kalmas, Sweden\". Ex Vandenbroucke Museum collection specimen, from Waregem, Belgium.","David Hospital",800,600,{"id":213,"source_url":214,"license_code":215,"credit_html":216,"title":217,"description":218,"author":219,"original_width":220,"original_height":221},8123,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=146512061","CC0 1.0","Fentriss, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=146512061\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Eukairitumangitmsm.jpg","\u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FEucairite\" class=\"extiw\" title=\"en:Eucairite\">Eucairite\u003C\u002Fa>, \u003Ca href=\"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FUmangite\" class=\"extiw\" title=\"en:Umangite\">Umangite\u003C\u002Fa>\n\u003Cdl>\u003Cdd>\u003Cdl>\u003Cdd>\u003Cdl>\u003Cdd>Weight: 37.2 g\u003C\u002Fdd>\n\u003Cdd>Dimensions: ca. 30 mm x 40 mm\u003C\u002Fdd>\n\u003Cdd>Locality: Cachenta Mine, Mendoza Province, Argentina\u003C\u002Fdd>\u003C\u002Fdl>\u003C\u002Fdd>\u003C\u002Fdl>\u003C\u002Fdd>\u003C\u002Fdl>","Fentriss",8447,7331,[223,229],{"id":224,"url":225,"label":226,"formula":227,"spacegroup":228,"year":178},4283,"\u002Fcif\u002F4283.cif","Frueh 1957 · Cu Ag Se (1)","Cu Ag Se","P m m n",{"id":230,"url":231,"label":232,"formula":227,"spacegroup":233,"year":178},4284,"\u002Fcif\u002F4284.cif","Frueh 1957 · Cu Ag Se (2)","P 4\u002Fn m m",[235,236,237,238,239,240,241,242],"Berzelinit","Berzelinita","Berzelinite","Cuivre Sélénié Argental","Eucairiet","Eucairit","Eukairite","Selenkupfersilber",[244,248,252,256,262],{"lang":245,"names":246},"ca",[247],"eucairita",{"lang":249,"names":250},"de",[251,242],"Eukairit",{"lang":253,"names":254},"eu",[255],"Eucairita",{"lang":257,"names":258},"fr",[259,260,261],"eucaïrite","euchaïrite","eukaïrite",{"lang":263,"names":264},"it",[265],"eucairite","Q3734119",{"history":11,"applications":11}]