福島県御斎所鉱山産のマンガン砒酸塩,マンガンの多いウォールキルデル石

概要

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Wallkilldellite is found in rhodonite-rhodochrosite-braunite ore from the Gozaisho mine, Fukushima Prefecture, in association with villyaellenite. The average chemical analysis of 5 analyses by EPMA gave CaO 8.89,MnO 34.06,CuO 0.67,SiO_2 0.51,As_2O_5 28.92,H_2O 26.95 (by difference) total 100wt.%, yielding the empirical formula (Ca_<2.45>Mn_<1.55>)_<Σ4.00>(Mn_<5.86>Cu_<0.13>)_<Σ5.99>(As_<3.88>Si_<0.13>)_<Σ4.01>O_<16>(OH)_8 19.08H_2O on the basis of total cations=14 in anhydrous part. The strongest lines in the X-ray powder diffraction pattern by a Gandolfi camera are 11.7 (100) (002), 3.27 (85) (110), 2.90 (50) (008), 2.13 (60) (120; 121), and 1.632 (80) (220). The cell parameters in hexagonal symmetry calculated from the powder diffraction pattern are : a=6.52 (1), c=23.1 (1)A, V=850.4A^3.
国立科学博物館の論文
2001-06-22