秩父帯層状マンガン鉱山産イネス石

概要

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Inesite was found from the Furui, Inosawa, engyoji, Tokoroyama and Kuratomi manganese ore deposits in the Northern Chichibu belt in Shikoku and Southern Chichibu belt in Kyusyu, and the Hashiradani, Maki, Kamoyama and Edagawa iron- manganese ore deposits in the Ino area which belongs to the Kurosegawa Tectonic belt. It occurs as inesite-calcite veins cutting caryopilite and braunite bearing silicious ores, and is commonly accompanied by calcianrhodonite, johannsenite and datolite. It is pink to reddish pink in color with viteous luster, and aciculer crystal up to 2 cm in length. Inesite coexisting with johannsenite : Ca_<0.99> Mn_<0.98>Mg_<0.02>Si_<2.01>O_6 is richer in Ca. It's empirical formula as anhydrite on O=28 is Ca_<2.43>Mn_<6.53> Fe_<0.02>Mg_<0.09>Si_<9.96>O_<28>, while, one with calcianrhodonite; Ca_<1.14>Mn_<3.64>Fe_<0.06>Mg_<0.06>Si_<5.05>O_<15> has high Mn content. Its' formula is Ca_<1.73>Mn_<7.27>Fe_<0.03>Mg_<0.08>Si_<9.94>O_<28>. Inesite was formed by the reactions of caryopilite + quartz or braunite + quartz and CaO, CO_2 bearing hydrothermal solution during the later stage of mineralization.
愛媛大学の論文
2001-03-19