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Ferrokesterite: Cu2(Fe,Zn)SnS4 Andorite: PbAgSb3S6
Comments: Small, tetragonal crystal of gray ferrokesterite (circled in thumbnail) attached on the surface of a larger striated andorite specimen. Location: San Jose mine, Oruro, Bolivia. Scale: Crystal size 0.2 mm. © John Veevaert