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Baumhauerite-2a: Pb3As4S9 Sphalerite: (Zn,Fe)S
Comments: Dark crystal of baumhauerite-2a (same shape as baumhauerite) with olive-green transparent sphalerite crystal on white dolomite. Location: Lengenbach quarry, Binntal, Valais, Switzerland. Scale: Picture 2 cm tall. © Walter Gabriel