高知市円行寺産 rosenhahnite 中の主成分 CO_3^<2-> の存在

概要

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Rosenhahnite from Engyoji, Kochi City, Japan, is proved to contain essential CO_3^<2-> after the combination of energy dispersive X-ray spectrochemical and wet chemical analyses, which gave SiO_2 49.63,FeO 0.42,CaO 45.48,H_2O 3.59,CO_2 1.60,total 100.72%, yielding the empirical formula (Ca_<2.96>Fe_<0.02>)_<Σ2.98>Si_<3.02>O_8 ((OH)_<1.46>O_<0.16>(CO_3)_<0.13>) on the basis of total cation=6 and the ideal formula Ca_3Si_3O_8((OH)_<2-4x>O_x(CO_3)_x). The material occurs as a vein mineral in greenstone fragments enclosed within serpentinite mass involved in Kurosegawa Tectonic Melange Zone. The veins consist of prehnite, rosenhahnite and xonotlite, cut pectolite veins, and are intersected by xonotlite veins. The mineral association is similar to that of the original locality, Russian River, California, U.S.A.
国立科学博物館の論文