| Abstract |
A new occurence of ferrohastingsite has been recently recognized by the author in the skarn zone of the Moji Mine, Kitakyusyu City, Fukuoka Prefecture. It occurs as aggregates, having a dark green col...our, being associated with epidote, hedenbergite and andradite. This ferrohastingsite has the following physical and optical properties: H = 5.5-6; sp. gr.=3.34±0.01; α=l.701, β=1.718, Y=l.721, r-α=0.020; -2V=9°~l3°; Z∧c=9°~l1°; X=greenish yellow, Y = brownish green, Z= bluish green. The chemical compositions are given in Table 2, viz. SiO_2, 41.75, TiO_2 1.05, Al_2O_2 10.02, Fe_2O_2 8.27, FeO 21.93, MnO 0.49, MgO 1.34, CaO 10.19, Na_O 1.28, K_2O 1.70, H_2O(+) 1.43, H_O(-) 0.29, F 0.31, Cl 0.11, ((less O for F and Cl), total 100.46 %. The formula is given as (Na_0.40K_0.34)_0.74Ca_1.72(Fe’’_2.88Mg_0.32Mn_0.07)_3.27(Fe’’_1.02Ti_0.33Al_0.42)_1.58(Si_0.38Al_1.42)_8.00O_22.00(O_0.35OH_1.49F_0.15Cl_0.03)_2.00. The X-ray powder data of the ferrohastingsites from the Moji, Obira and Kinbu Mine are also given in Table 3.show more
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