Inyoite from Fuka, Okayama Prefecture, Japan
スポンサーリンク
概要
- 論文の詳細を見る
Inyoite was found as fissure fillings in calcium borate minerals, which occur as an irregularly shaped body in the crystalline limestone near the gehlenite-spurrite skarns at the Fuka mine, Okayama Prefecture, Japan. Inyoite occurs as aggregates of tabular crystals up to 1 mm wide, and rarely as euhedral crystals up to 0.5 mm wide in fissures of calcium borate minerals such as nifontovite, pentahydroborite, sibirskite and parasibirskite. The fissure fillings are composed only of inyoite. This is the first finding of inyoite in Japan. The type of occurrence is also different from those in many other localities in the world. Electron microprobe and CHNS / O analyses gave the empirical formula Ca1.99B5.96O5.92(OH)10·8.08H2O on the basis of O = 24. The unit cell parameters are a = 10.616(2), b = 12.068(1), c = 8.404(1) Å and β = 114.01(1)°. The mineral is optically biaxial negative with refractive indices α = 1.492, β = 1.506 and γ = 1.517, giving a calculated 2V = 82°. The Vickers microhardness is 91 kg mm−2 (10 g load) and the Mohs hardness number is 2.5. The measured density is 1.875 g cm−3. It is likely that the inyoite at the Fuka mine was formed by a reaction of ground water with calcium borate minerals at a temperature of around 20°C.
- 2004-04-01
著者
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KOBAYASHI Shoichi
Department of Applied Science, Faculty of Science, Okayama University of Science
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KUSACHI Isao
Department of Earth Sciences, Faculty of Education, Okayama University
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Kusachi I
Okayama Univ. Okayama Jpn
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Kusachi Isao
Dep. Of Earth Sciences Fac. Of Education Okayama Univ.
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Kusachi Isao
Department Of Earth Sciences Okayama University
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Kusachi Isao
Department Of Earth Science Faculty Of Education Okayama University
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Kobayashi S
Dep. Of Applied Sci. Fac. Of Sci. Okayama Univ. Of Sci.
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Kobayashi S
Division Of Earth Sciences Kurashiki University Of Science And The Arts
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YAMAKAWA Junji
Department of Earth Sciences, Graduate School of Natural Science and Technology, Okayama University
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Yamakawa J
Okayama Univ. Okayama Jpn
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Yamakawa Junji
Department Of Earth Sciences Graduate School Of Natural Science And Technology Okayama University
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Yamakawa Junji
Department Of Earth Sciences Faculty Of Sciences Okayama University
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Kusachi Isao
Department Of Earth Sciences Faculty Of Education Okayama Univresity
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Kobayashi S
National Food Res. Inst. Tsukuba Jpn
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Kobayashi Shoichi
Department Of Applied Science Faculty Of Science Okayama University Of Science
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Kobayashi Shoichi
Department Of Earth Sciences Faculty Of Science Okayama University Of Science
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Kobayashi S
Kurashiki Univ. Kurashiki Jpn
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Kishi Shigetomo
Department Of Earth Sciences Faculty Of Science Okayama University Of Science
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TANABE Mitsuo
2058-3 Niimi, Niimi 718-0011, Japan
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KISHI Shigetomo
534 Kagamino-cho Tomata-gun 708-0345, Japan
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KOBAYASHI Shoichi
Department of Agro-bioscience, Iwate University
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