Bementite and Pyroxmangite from the Ichinomata Mine, Kumamoto Prefecture

概要

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The material was collected from the manganese ore deposit of the Ichinomata mine, situated about 18km south of Yatsushiro City, Kumamoto Prefecture. Associated minerals are rhodochrosite, tephroite and hornstone-quartz.<BR>Bementite forms semitransparent masses with various shades of brown. Under the microscope, practically monomineralic aggregate of very minute flakes of bementite. H=512;, d=3.03, α'=1.631, γ'=1.633, γ-α'=0.002.<BR>Pyroxmangite is a minor constituent of the siliceous manganese ore of this mine. It occurs as porcelain-like masses with pinkish grey color. Under the microscope very fine granular. In places it appears as minute fibrous crystals, arranged radially and spherulitic. H=6, d=3.26, α=1.717, γ=1.732.<BR>X-ray powder photographs, chemical composition and D.T.A. curves were examined on the two minerals and mineralogical problems concerning their relations to ganophyllite and rhodonite respectively were discussed to a certain extent.
日本鉱物科学会の論文