Sulphide, paramorph of sternbergite
Specific gravity: 4.25
Hardness: 3½ to 4
Colour: Bronze-brown, tarnishing to lead-grey
Common impurities: Cu,As
Argentopyrite is a rare sulphide in silver-bearing hydrothermal veins,
calcite and quartz
The type locality is Jáchymov, Karlovy Vary District, Karlovy Vary Region, Czech Republic. In a specimen from here aggregates of nickelskutterudite are abundant, occurring earlier than argentopyrite. Considerable associated proustite was also noted (AM 39.475-485).
In a specimen from Freiberg, Mittelsachsen, Saxony, Germany, argentopyrite was associated with gypsum, which appears as tiny crystals perched on a crust of argentopyrite and arsenic. Some proustite and occasional grains of pyrite were also observed (AM 39.475-485).
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