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Jacobsite: (Mn++,Fe++,Mg)(Fe+++,Mn+++)2O4 Barite: BaSO4
Comments: Sharp, octahedral crystals of Jacobsite on a bladed barite matrix.
Location: N' Chwaning II Mine, Kuruman, South Africa.
Scale: 3x2.5x1.9 cm.
© Isaias Casanova / IC Minerals
Jacobsite: (Mn++,Fe++,Mg)(Fe+++,Mn+++)2O4 Ganomalite: Pb9Ca5Mn++Si9O33
Comments: White crystalline ganomalite with dark granular jacobsite.
Location: Jacobsberg, Varmland, Sweden.
Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species