福島県御斎所鉱山産アーセニオプレー石

概要

論文の詳細を見る
Arseniopleite is found in metamorphosed manganese ore from the Gozaisho mine, Fukushima Prefecture, Japan. It is reddish brown in color and forms aggregates composed of platy crystals in rhodonite-braunite ore in association with sarkinite, brandtite, Ce-bearing romeite, quartz, barite, aegirine, K-feldspar, and albite. The representative chemical analysis by EDS indicates Na_2O 6.39,CaO 5.45,PbO 0.87,MgO 2.84,MnO 25.61,Fe_2O_3 3.52,As_2O_5 55.22,total 99.90wt.%, and leads to the empirical formula, (Na_<0.91>Pb_<0.03>)_<Σ0.94> (Ca_<0.61>Na_<0.39>) <Σ1.00>Mn_<1.00>(Mn_<1.28>Mg_<0.44>Fe_<0.28>)_<Σ2.00>As_<3.03>O_<12>, on the basis of O=12. The strongest lines in the X-ray powder diffraction pattern are 6.54 (19) (020), 3.28 (22) (040), 3.00 (21) (311), 2.83 (100) (330), 2.80 (30) (400), 2.68 (26) (132^^-), and 2.19 (17) (251). The calculated cell parameters from the X_ray powder diffraction data are : a=11.320 (7), b=13.118 (7), c=6.872 (6)A, β=98.85 (5)°, V=1008 (1)A^3 in a setting of the space group P2_1/c.
国立科学博物館の論文
2001-12-22