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Weibullite: Pb6Bi8(S,Se)18 Nordstromite: Pb3CuBi7(S10Se4)
Comments: Fibrous, silvery crystals of nordstromite. Lacking a chemical analysis it is possible that the crystal is weibullite instead. Location: Falu mine, Falun, Sweden. Scale: Crystal Size 1 mm. © Tom Loomis / Dakota Matrix