Proustite

Jáchymov (St Joachimsthal), Jáchymov District, Krušné Hory Mountains (Erzgebirge), Karlovy Vary Region, Bohemia  Czech Republic (05/1732)

Specimen size: 1 × 0.9 × 0.7 cm = 0.39” × 0.35” × 0.28”