二,三のシロウンモ,キンウンモの化学性,光学性並びに構造型について

The author reported the results of the chemical compositions, the optical properties, and the differential thermal analysis curves, and determined the structural types of three specimens of mica group mineral.The chemical formula and the structural type of hydrous muscovite, which was found in muscovite vein in serpentine rock from Maruo, Ube City, Yamaguchi Pref., Japan, are as follows :(K0.63Na0.12Ca0.02 (H3O)0.29)1.06 (Al2.08Ti0.01Fe''0.01Fe'''0.07Mg0.05)2.22 (Al1.11Si2.89)4.00O10(OH)2.00· Structural type ; 2M1, a=5.19A, b=8.99A, c=20.09A, β=95°30'.The chemical formula and the structural type of muscovite, which was found in “Roseki” deposit embedded in liparite from the Uku Mine, Yamaguchi Pref., Japan, are as follows:(K0.69Na0.13Ca0.02 (H2O)0.15)0.99 (Al2.05 Fe'''0.03 Mg0.08)2.16 (Al1.16 Si2.84)4.00O10 (OH)2.00 Structural-type ; 2M1, a=5.18A, b=9.00A, c=20.18A, β=95°K20'.The chemical formula and the structural type of biotitic phlogopite, which was found in cavity in basalt from Mutsure Island, Yamaguchi Pref., Japan, are as follows : (K0.82 Na0.31 Ca0.01)1.14 (Mg2.16 Fe''0.46 Fe'''0.18 Mn0.01 Ti0.20)3.01 (Al0.89 Si2.97)3.86 O10(OH1.48 F0.07)1.55· Structural type ; Monoclinic three-layer structure (“3M”). a=5.30A, c=9.24A, C=30.56A, β=90°30'.The author discussed the relationship between the conditions of its formation and the structural types on the basis of the above mentioned three mica and previously reported data.