<報文>水マンガン鉱の仮晶を有する2,3のパイロルース鉱について

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  • スイマンガンコウ ノ カショウ オ ユウスル 2 , 3 ノ パイロルースコウ ニ ツイテ
  • <Original Papers>Some Pyrolusite Pseudomorphs after Crystals of Manganite in Japan

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Perfect pseudomorphs of pyrolusite after crystals of manganite were newly discovered in fourteen localities in Japan. These crystals 0.1 to 5mm in size occur in cavities and veinlets of massive manganese dioxide ores mainly composed of cryptomelane, pyrolusite and ramsdellite. In this report morphological, optical, thermal and X-ray diffraction studies were made of samples from three localities, namely, Hayaseno Mine, Aomori Prefecture, Yunosawa Mine, Hokkaido and Hiroya, Niigata Prefecture. Crystals are commonly prismatic in habit with c(001) and d(210) prominent, sometimes m(110), b(010), c(001) and f(021) subordinate and less often tabular parallel to the C axis. Faces in prism zone are often striated parallel to (001). Crystals from Yunosawa Mine are pseudomorphs, with pyrolusite and relict manganite in their interior, pyrolusite in the exterior parts, as the microscopic examination of polished sections showed.

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