Ourayite

ourayite

matildite

berryite

aikinite

Images

Formula: Ag₃Pb₄Bi₅S₁₃
Sulphosalt of silver, lillianite homologous series group, lead and bismuth
Crystal System: Orthorhombic
Specific gravity: 7.18 calculated
Hardness: 2
Colour: Grey
Common impurities: Cu,Sb
Environments

Hydrothermal environments

Localities

At the Ivigtut Mine, Arsuk Fjord, Sermersooq, Greenland, ourayite is the major sulphosalt phase, found in a cryolite body associated with berryite, aikinite, galena, matildite, chalcopyrite, pyrite, native bismuth, native gold, topaz and fluorite (CM 22.565-575, HOM).

At the Deo Gratias Mine, La Cienega, Pitiquito Municipality, Sonora, Mexico, ourayite occurs with base-metal sulphides in diopside tactite, associated with sphalerite, galena and chalcopyrite (HOM).

At the type locality, the Old Lout mine, Poughkeepsie Gulch, San Juan County, Colorado, USA, ourayite was found in a hydrothermal sulphide vein as laths less than 0.1 mm long in a fine-grained matrix of galena and matildite, from a single sample labelled "beegerite" (discredited species) (AM 64.243).

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