Chemical Studies of Minerals Containing Rarer Elements from the Far East District. LXV. Pollucite from Nagatare, Fukuoka Prefecture, Japan
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概要
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The chemical analysis of pollucite found in a granite pegmatite at Nagatare, Fukuoka Prefecture, gave SiO<SUB>2</SUB> 46.03, Al<SUB>2</SUB>O<SUB>3</SUB> 17.76, Fe<SUB>2</SUB>O<SUB>3</SUB> 0.02, MnO 0.01, CaO 0.03, Li<SUB>2</SUB>O 0.16, Na<SUB>2</SUB>O 2.08, K<SUB>2</SUB>O 1.81, Rb<SUB>2</SUB>O 0.61, Cs<SUB>2</SUB>O 28.88, and H<SUB>2</SUB>O 2.74; total 100.13%; recalculated as (Cs,Rb)<SUB>0.573</SUB>(Na,K,Li,Mn,Ca)<SUB>0.316</SUB>(Al,Fe)<SUB>0.943</SUB>Si<SUB>2.071</SUB>O<SUB>6</SUB>·0.411 H<SUB>2</SUB>O as O=6, thus satisfying the crystallochemical formula advocated by Beger. X-ray single crystal and powder studies have shown it to be cubic, the space group is Ia3d; <I>a</I><SUB>0</SUB>=13.674±0.005 Å. It is optically isotropic or very faintly birefringent, with <I>n</I>=1.520±0.002.
- 公益社団法人 日本化学会の論文
著者
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Nagashima Kozo
Department Of Chemistry The University Of Tsukuba
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Kato Akira
Department Of Anesthesiology Kansai Medical University
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KATO Akira
Department of Geology, National Science Museum
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Sakurai Kin-ichi
Department of Geology, National Science Museum
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Kuwano Noriyuki
Institute of Metallurgy, Faculty of Technology, Kyushu University
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