<報文>青森県南股鉱山産マンガン鉱石の鉱物組成 : とくにラムスデル鉱の産出について

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  • アオモリ ケンナン コ コウザンサン マンガン コウセキ ノ コウブツ ソセイ
  • <Original Papers>Mineral Composition of Manganese Ores from Minamimata Mine, Aomori Prefecture, with Special Reference to the Occurrence of Ramsdellite

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The bedded manganese ore deposits of Minamimata Mine occur in the bentonite clay consisting of montmorillonite, zeolite, cristobalite, quartz and feldspar of the middle-lower Miocene green tuff formation. Manganese ore minerals in the lower zones of deposits are pyrolusite, cryptomelane, manganite, birnessite, todorokite and ramsdellite (the second occurrence in Japan), but in the oxidized zones, manganite is altered to pyrolusite. These manganese minerals were studied by means of X-ray powder method and differential thermal and chemical analyses.

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