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Formula: AgFe2S3
Sulphide, paramorph of
argentopyrite
Crystal System: Orthorhombic
Specific gravity: 4.101 to 4.215 measured, 4.275 calculated
Hardness: 1 to 1½
Streak: Black
Colour: Golden brown, tarnishes violet-blue
Environments:
Sternbergite is a secondary silver sulphosalt that occurs in hydrothermal veins in
silver-bearing ore deposits (Webmin, HOM).
Associated minerals include stephanite,
acanthite, proustite,
pyrargyrite, argentopyrite,
xanthoconite, pyrite,
galena, sphalerite,
dolomite, calcite and
quartz
(HOM).
The type locality is Jáchymov, Karlovy Vary District, Karlovy Vary Region, Czech Republic.
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