POLYBASITE - PEARCEITE (Ag,Cu)16(Sb,As)2S11 Monoclinic

Description: Polybasite -pearceite are a series of black minerals formed in moderate to low temperature silver-rich hydrothermal deposits.

FOREST COUNTY: Polybasite-pearceite are very rare in the Crandon massive sulfide deposit, near Little Sand Lake. The mineral occurs with stephanite and tetrahedrite-tennantite as very tiny grains intergrown with galena. (Lambe and Rowe, 1989).

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