| 概要 |
Optical, physical, and chemical properties, and unit cell size for five manganese garnets have been determined and calculated. The five manganese garnets were collected from the manganese ore deposits... of Kiuragi mine, Saga Pref., Tsutsumi mine, Furujuku mine, Kinko mine, Yamaguchi Pref., and Mie mine, Nagasaki Pref., Japan. The manganese garnet of the Kiuragi mine occurs in the Sangun metamorphic rocks, and is associated with rhodonite and tephroite. Optical and physical data are as follows: colour, reddish brown; grain size, 0.5~1.0 mm; specific gravity, 4.042; refractive indices, 1.806; unit cell size, 11.656A. Molecular percent compositionar: pyrope, 5.4; andradite, 12.3; almaiidine, 19.0; grossular, 11.7; spesstine, 51.4, or pyrope, 5.5; almandine, 18.8; grossular, 24.0; calderite, 12.3; spessartine 38.9. The manganese garnet of the Tsutsumi mine occurs as banded crystal aggregates in rhodonite ore in the Paleozoic sediments. Optical and physical properties are as follows: colour, grayish brown to dark brown; specific gravity, 4.070; refractive indices, 1.798; unit cell size, 11.610A. Molecular percent composition: pyrope, 1.4; almandine, 10.5; grossular, 12.4; spessartine, 75.2. The managanese garnet of the Furujuku mine is found in the Paleozoic sediments, and is associated with rhodonite. Optical and physical properties are as follows; colour, light yellow to grayish brown; grain size, 0.2~0.8 mm in diameter; specific gravity, 3.979; refractive indices, 1.781; unit cell size, 11.683A. Molecular percent composition: almandine, 2.1; grossular, 28.2; spessartine, 69.5. The manganese garnet of the Kinko mine is found in the P~leozoic sediments. Optical and physical properties are as follows: colour, yellowish green; grain size, 0.2~1.0 mm in diameter; specific gravity, 4.146; refractive indices, 1.797; unit cell size, 11.594 A.Molecular percent composition: grossular, 2.9; spessartine, 96.0. The manganese garnet of the Mie mine occurs in the Sambagawa metamorphic rocks and is associated with braunite ore. Optical and physical properties are as follows: colour, yellowish brown; grain size, 0.3~0.5 mm in diameter; specific gravity, 4.160; refractive indices, 1.792; unit cell size, 11.623A. Molecular percent composition: pyrope, 4.0; almandine, 1.9; grossular, 12.4; spessartine, 81.0.続きを見る
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Mendeley出力
