<報文>東北地方産ケイ酸マンガン鉱の鉱物学的研究(第21報) : 岩手県肘葛鉱山産バスタム石について

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Four chemical analyses of bustamite are presented. The material is from the high grade metamorphosed bedded manganese ore deposits of the Hijikuzu mine. Lime-rich bustamite is grayish white (specimen I) to pale brownish-pinkish white (specimen II) in color and is associated with a small quantity of mangaoan hedenbergite. The end member ratios of these two specimens are FeSiO_3 8.10,9.76 ; MnSiO_3 13.19,18.00 ; MgSiO_3 2.47,2.59 ; CaSiO_3 76.24,69.63 mol. %, respectively. Lime-poor bustamite is pale pink (specimen III) to pale brownish red (specimen IV) in color, and the associated minerals are ferroan rhodonite and pyroxmangite. The ratios of end member are FeSiO_3 13.25,19.86 ; MnSiO_3 39.24,46.31 ; MgSiO_3 0.92,0.72 ; CaSiO_3 46.60,33.11 mol. %, respectively. Variation in optical properties, specific gravity and unit cell dimensions within bustamite solid solution are presented graphically in variation diagrams versus (Mn, Fe) SiO_3 mol. %. In the composition range of 20 to 70 mol % (Mn, Fe) SiO_3,a_0,b_0 and c_0 cell dimensions and cell volume shows an appreciable and systematic variation with composition, whereas axial angles (α, β and γ) vary little. Completely indexed powder diffraction patterns of four specimens are given. On heat treatment above 1,100℃ in air, the x-ray patterns of lime-poor materials (specimens III and IV) show the bustamite, jacobsite (Mn_3O_4 30%) and tridymite lines, whereas those of lime-rich materials (specimens I and II) show the bustamite and tridymite lines.
東北大学の論文
1977-09-30

<報文>東北地方産ケイ酸マンガン鉱の鉱物学的研究(第21報) : 岩手県肘葛鉱山産バスタム石について

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