Sulphosalt, forms a series with proustite
Specific gravity: 5.85
Hardness: 2½； to 3
Streak: Cherry red
Colour: Red to black
Solubility: Slightly soluble in nitric acid
Common impurities: As
Pyrargyrite is a late-stage, low temperature mineral in the enrichment zone of
epithermal (low temperature) hydrothermal
silver ore veins. Also formed by secondary
processes (Mindat, HOM). Associated minerals include silver,
acanthite, tetrahedrite, other
calcite, dolomite and
At the Santa Catarina mine, Guanajuato, Mexico, acanthite pseudomorphs after pyrargyrite have been found (KL p125).
At Zacatecas, Mexico, silver pseudomorphs after pyrargyrite have been found (KL p118).
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