Occurrence and crystal chemical features of protoferro-anthophyllite and protomangano-ferro-anthophyllite from Cheyenne Canyon and Cheyenne Mountain, U. S. A. and Hirukawa-mura, Suisho-yama, and Yokone-yama, Japan

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概要

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• The crystal chemical features and occurrence of the new orthoamphiboles (space group Pnmn), protoferro-anthophyllite and protomangano-ferro-anthophyllite, are described. Protoferro-anthophyllites (PFA) are found in fayalite masses from granitic pegmatites at Cheyenne Canyon and Cheyenne Mountain, Colorado, U.S.A. and at Hirukawa-mura, Gifu Prefecture, Japan. Protomangano-ferro-anthophyllites (PMFA) are found in Mn-rich fayalite masses from granitic pegmatites at Suisho-yama, Fukushima Prefecture, and in bedded manganese ore deposits at Yokone-yama, Tochigi Prefecture, Japan. The empirical formulas of PFA from Hirukawa-mura and PMFA from Yokone-yama are (Fe1.54Mn0.42Mg0.14)Fe5(Si7.9Al0.1)O22(OH)2 and (Mn1.38Fe0.59)(Fe4.1Mg0.9Ca0.03)Si8O22(OH)2, respectively. The unit cell parameters of PFA are a = 9.388(2), b = 18.387(4), and c = 5.347(1) Å, and those of PMFA are a = 9.425(2), b = 18.303(4), and c = 5.345(1) Å. These minerals are isostructural with synthetic protofluorian-lithian-anthophyllite (Pnmn, Z=2), and have a straight double-tetrahedral chain (O(5)-O(6)-O(5) angle of 177° and 179°, respectively) and M(1), M(2), and M(3) octahedra of regular shape. PFA and PMFA are optically biaxial negative with refractive indices α = 1.690, β = 1.710, and γ = 1.726, and α= 1.695, β = 1.714, and γ = 1.731, respectively. The density (calc.) of PFA is 3.54 and that of PMFA is 3.44 g/cm3. Some PFA and PMFA include fine clinoamphibole lamellae (space group C2/m). PFA may be produced by hydrothermal alteration of fayalite, and PMFA may be similarly produced by alteration of Mn-rich fayalite and also by metasomatism in bedded manganese ore deposits.

• 日本鉱物科学会の論文
• 2002-08-01

著者

• Bunno Michiaki

  Geological Museum Geological Survey Of Japan

• KUROSAWA Masanori

  Institute of Geoscience, University of Tsukuba

• Sueno Shigeho

  Institute Of Geoscience The University Of Tsukuba

• MATSUURA Shigeru

  Central Research and Development Center, Taiheiyo Cement Corporation

• Matsuura Shigeru

  Central Research And Development Center Taiheiyo Cement Corporation

• Kurosawa Masanori

  Institute Of Geoscience University Of Tsukuba

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