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Bournonite: PbCuSbS3
Comments: Bright, blocky crystalline aggregate of steel gray bournonite crystals. Location: Yao-gan-xian mine, Hunan China. Scale: Picture size 2 cm. © Fabre Minerals
Comments: Lustrous, silvery crystals of bournonite on massive bournonite. Location: Mercedes Mine, Huanuco Dept., Peru. Scale: 3x3x2.7 cm. © Isaias Casanova / IC Minerals