diaphorite

diaphorite

[dī′af·ə‚rīt]
(mineralogy)
PB2 Ag3Sb3S8 A gray-black orthorhombic mineral consisting of sulfide of lead, silver, and antimony, occurring in crystals. Also known as ultrabasite.
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Associated minerals are: (dominant) miargyrite; (less frequent) pyrargyrite, stannite and kesterite; (trace) andorite, diaphorite, robinsonite, galena, chalcopyrite, sphalerite and pyrite.
arsenic, arsenopyrite, arsenosulvanite, barite, (*) berndtite, bismuthinite bournonite, calcite, cassiterite, chalcopyrite, chlorargyrite, diaphorite, franckeite, freibergite galena, goethite (iridescent), goslarite, halotrichite, hematite, jamesonite, jarosite, matildite, melanterite, miargyrite, nacrite, (*) ottemannite, phosphophyllite, pickeringite, pyrargyrite, pyrite, pyrostilpnite, quarz, siderite, sideronatrite, siderotil, silver, smitsonite, sphalerite, stannite, stephanite, stibnite, tetrahedrite, valentinite, voltaite, wavellite, wolframite, wurtzite Cerro San Pedro Large orthoclase phenocrysts, often replaced by quartz, chlorite, siderite, etc.
Diaphorite and fizelyite were first observed in Canada at the Van Silver mine, and it is the second reported occurrence in Canada for semseyite, miargyrite and pyrostilpnite.
In 1966 one of the authors (AES), during the course of a property evaluation for a Canadian mining company, collected and later identified diaphorite and miargyrite from the Silver Tunnel.
Miargyrite is one of the earliest minerals and is commonly overgrown with diaphorite and later minerals.
Diaphorite occurs as dull to brilliant, black, prismatic crystals, commonly 1-2 mm in length and about 0.
Diaphorite occurs most frequently in galena-rich veins.
The only evidence for placing bournonite in the stage-2b sequence is a single specimen with a boumonite crystal overgrowth on a diaphorite crystal.
Diaphorite has recently been identified (by X-ray diffraction) as complex, 3-mm crystals associated with miargyrite in vugs in massive pyrargyrite.
The recently discovered Potosi vein is producing complex, lustrous, 4-mm to 5-mm crystals associated with crystals of diaphorite, pyrostilpnite and pyrargyrite, in vugs in massive pyrargyrite and miargyrite.
Associated species include crystals of diaphorite, miargyrite, quartz, pyrargyrite, pyrite, siderite and valentinite.
Acanthite (*)Anhydrite Arsenopyrite (*)Barite Bornite Boulangerite (*)Bournonite Diaphorite (*)Geocronite (*)Gypsum Hubnerite Jamesonite Miargyrite Orpiment Polybasite Pyrargyrite Realgar Rhodonite Stibnite