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Formula: Ag5SbSe4
Valence: Ag1+5Sb3+Se2-4
Selenide of silver and
antimony
Crystal system: Orthorhombic
Specific gravity: 7.5 calculated
Hardness: 2½ to 3
Colour: Grey-black
Solubility: Becomes dark in FeCl and brown in concentrated HNO3. No reaction with concentrated KCl, KOH, or HCl
Environments
Localities
At the type locality, the Rudnaya Sopka Ag-Au deposit, Chukotka Autonomous Okrug, Russia, selenostephanite occurs
in quartz and
orthoclase-quartz veins with other
silver minerals in a volcanogenic
gold-silver deposit. Associated minerals
include miargyrite, clausthalite,
gold-silver alloy,
pyrargyrite, acanthite,
clausthalite, naumannite,
argyrodite,
tetrahedrite–tennantite,
pyrite, sphalerite,
chalcopyrite, orthoclase and
quartz
(HOM).
Selenostephanite from the Rudnaya Sopka Ag-Au deposit -
Image
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