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Pyrostilpnite: Ag3SbS3
Comments: Deep bright-red, acicular crystals of pyrostilpnite to 1mm in vuggy sulfide matrix. Location: Cerro Rico, Potosi City, Potosi Dept., Bolivia. Scale: Picture size 5 mm. © Tom Loomis / Dakota Matrix
Comments: Reddish brown, crystalline aggregate of pyrostilpnite on matrix. Location: St. Audreasberg, Hartz, Lower Saxony, Germany. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals