Naumannite

naumannite

clausthalite

aguilarite

tiemannite

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Formula: Ag₂Se
Selenide
Specific gravity: 7.0 to 8.0
Hardness: 2½
Streak: Black
Colour: Grey-black
Stable below 133^oC (AM 56.1882-1888)
Common impurities: Pb,S
Environments

Hydrothermal environments

Naumannite occurs in hydrothermal veins deficient in sulphur, associated with other selenides, quartz, and carbonates (Webmin, HOM). Associated minerals include clausthalite, aguilarite, acanthite, tiemannite, umangite, eucairite, argentian tetrahedrite, argentian gold, pyrite and chalcopyrite (HOM).

Localities

The type locality is Tilkerode, Harz, Saxony-Anhalt, Germany.

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