Sulphosalt of silver, lead and bismuth
Specific gravity: 7.18 calculated
Common impurities: Cu,Sb
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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