埼玉県秩父鉱山大黒マンガン鉱床産二酸化マンガン鉱の鉱物組成

概要

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The Daikoku manganese deposit in the Chichibu mine occurs in paleozoic sedimentary rocks, and manganese ore minerals in the vein consist mainly of rhodochrosite, the so-called manganoan ankerite and manganese dioxide minerals. Only part of the manganese dioxide minerals is formed bv weathering. It is considered, however, from the observation of occurrence, ore structure and mineral paragenesis that the larger part of manganese dioxiae ore minerals is deposited from hydrothermal solutions. Manganese dioxide ore minerals were studied by means of microscopic observation, X-ray powder method, differential thermal and thermo-gravimetric analysis and chemical analysis. These ore minerals were composed of yokosukaite, resembling todorokite, amorphous manganese dioxide mineral and some unidentified manganese minerals. The mineralogical propertiese of ore minerals may be summarized as follows. Yokosukaite shows the typical characters of T.G.A. and D.T.A. curves, and its chemical formula is ( Mn^<2+>_<0.10> Na_<0.04>)_<0.04> Mn^<4+>_<0.86>O_<1.69> (OH)_<0.31>. Resembling todorokite has been identified only by the X-ray pattern, which shows good agreement with Wadsley's compound, (Na, Mn) Mn_3O_7・2 H_2O. The X-ray pattern of amorphous manganese dioxide mineral has been shown that is amorphous, chemical formula MnO_2,D.T.A. curve has no peak, and the loss in weight is about 10% at 200 to 800℃.
東北大学の論文
1964-03-30