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Dufrenoysite: Pb2As2S5
Comments: Single, black dufrénoysite crystal in a vug in white dolomite. Location: Lengenbach quarry, Binntal, Valais, Switzerland. Scale: Crystal size 2.5 mm. © Walter Gabriel
Comments: Black prismatic crystal of Dufrenoysite with brassy yellow pyrite on succroidal dolomite. Location: Lengenbach quarry, Binntal, Valais, Switzerland. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals