Uytenbogaardtite

minerals

acanthite

chlorargyrite

naumannite

Images

Formula: Ag₃AuS₂
Sulphide, forms a series with fischesserite
Crystal System: Trigonal
Specific gravity:
Hardness: 2
Colour: Greyish white
Common impurities: Cu,Se,Te
Environments

Hydrothermal environments

Uytenbogaardtite occurs in low-temperature hydrothermal gold-silver quartz veins, in part of supergene origin, associated with acanthite, an Au–Ag alloy, chlorargyrite, naumannite and quartz (HOM). It may form as exsolutions in acanthite (Mindat).

Localities

There are three co-type localities:
(1) Tambang Sawah, Rejang Lebong District, Bengkulu Province, Indonesia
(2) The Zmeinogorsk mine, Zmeevka Stream, Korbalikha River, Alei River Basin, Altai Krai, Russia
(3) The Comstock Mining District, Storey county, Nevada, USA
Uytenbogaardtite occurs as blebs up to 100 microns across and as rims intimately associated with acanthite, gold variety electrum and quartz, at all three localities (AM 65.209).

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