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Manganilvaite: CaFe++Fe+++(Mn,Fe++)(Si2O7)O(OH)
Comments: Small, black, very bright crystals of manganilvaite on a matrix of clear quartz, white calcite, and tiny brassy pyrite crystals. Location: Daye mining area, Hubei, China. Scale: 6 x 5.6 x 3.7 cm. © Fabre Minerals