AN INTERSTRATIFIED MINERAL OF MICA AND MONTMORILLONITE FROM THE MINERALIZED DISTRICT AT NIIDA NEAR THE SHAKANAI MINE, AKITA PREFECTURE, JAPAN

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概要

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• An interstratified mineral of mica and montmorillonite was found in some drill cores at the Niida mineralized district near the Shakanai mine. The interstratification is produced by a two component stacking of about 60% mica-like layers and about 40% montmorillonite-like layers. The DTA curve shows double endothermic peaks for the dehydroxylation of the silicate layer. The infra-red data give 1M illite and montmorillonite bands and band shifts, when heated to 500° and 550℃. Chemical composition : SiO_2 47.13% ; TiO_2 0.33% ; Al_2O_3 31.76% ; Fe_2O_3 0.87% ; MgO 0.35% ; MnO trace ; CaO 0.94% ; K_2O 2.85% ; Na_2O 0.04% ; H_2O^+ 8.66% ; H_2O^- 6.97% ; total 99.90%.

• 日本粘土学会の論文

著者

• Shimoda Susumu

  Geological And Mineralogical Institute Tokyo University Of Education

関連論文

• AN INTERSTRATIFIED MINERAL OF MICA AND MONTMORILLONITE FROM THE MINERALIZED DISTRICT AT NIIDA NEAR THE SHAKANAI MINE, AKITA PREFECTURE, JAPAN
• A FERRIC CELADONITE IN AMYGDALES OF DOLERITE AT TAIHEIZAN, AKITA PREFECTURE, JAPAN

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