Fischesserite

fischesserite

naumannite

clausthalite

permingeatite

Images

Formula: Ag₃AuSe₂
Selenide
Crystal System: Isometric
Specific gravity: 9.05 calculated
Hardness: 2
Colour: Black
Luminescence: Not fluorescent under UV
Common impurities: Cu
Environments

Hydrothermal environments

Localities

At the type locality, the Předbořice deposit, Předbořice, Kovářov, Písek District, South Bohemian Region, Czech Republic, fischesserite occurs in carbonate veins in epithermal precious metal deposits. Associated minerals include naumannite, clausthalite, permingeatite, gold, calcite and quartz (HOM).
Fischesserite from Předbořice - Image

At the De Lamar Mine, De Lamar Mining District, Owyhee County, Idaho, USA, a sample of fischesserite has associated minerals naumannite, covellite and pyrite; the gangue mineral is calcite. Fischesserite occurs as anhedral to subhedral grains up to 300 microns across. It does not show any inclusions of other minerals or intergrowths (CM 42.6.1733–1737).
Fischesserite from the De Lamar Mine - Image

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