Sulphosalt, forms a series with polybasite
Specific gravity: 6.15
Streak: Reddish black
Colour: Black with dark red internal reflections
Common impurities: Zn,Fe,Sb
Pearceite is an arsenic-bearing mineral that occurs in hydrothermal deposits
formed at low to medium temperatures associated with
baryte and calcite
At Pozos, Mexico, pearceite is associated with chalcopyrite (AM48.655-572).
At Tuscarora, Nevada, USA, pearceite is associated with pyrite (AM48.655-572).
At the Mangani mine, Sumatra, pearceite occurs on drusy quartz (AM48.655-572).
At Uchucchacua, Lima department, Peru, pearceite is associated with chalcopyrite, and sometimes proustite (Minrec 42.2.156).
At Silver Plume, Cochise county, Arizona, USA, pearceite is associated with galena. Separately, pearceite-polybasite twins are scattered on partially resorbed crystals of acanthite after acanthite variety argentite) (R&M87.4.304-337).
At the Rico district, Dolores county, Colorado, USA, pearceite is associated with chalcopyrite and tennantite (R&M87.4.304-337).
At Smuggler Hill, Lake county, Colorado, USA, pearceite is found as intergrowths with baryte and occasionally with galena or tennantite. Native silver is often found replacing pearceite (R&M87.4.304-337).
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