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Adachiite, a Si–poor member of the tourmaline supergroup from the Kiura mine, Oita Prefecture, Japan
Journal of Mineralogical and Petrological Sciences
Adachiite, CaFe 3 Al 6 (Si 5 AlO 18 )(BO 3 ) 3 (OH) 3 (OH), a Si-poor member of the tourmaline supergroup, is found in the hydrothermal vein cutting emery from Nabagasako of the Kiura mine, Saiki City, Oita Prefecture, Japan. Adachiite occurs as a constituent (several to 300 µm thickness) of hexagonal prismatic crystals, and forms a zoned structure closely associated with schorl. It is transparent with brownish-purple to bluish-purple color, while the massive aggregate shows black in color.doi:10.2465/jmps.131020b fatcat:ba5mjrjepzb7hiviochucgn33m