Chemical Analysis of Thortveitite from Oro, Mineyama-cho, Naka-gun, Kyoto Prefecture, Japan.

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概要

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• The geochemically interesting rare mineral, thortveitite, from Oro, Kyoto Prefecture was studied. Major constituents, scandium, yttrium, and lanthanoids, niobium, tantalum, aluminum, titanium, iron, calcium, and manganese were determined. The chemical analysis of the mineral assemblage gave Sc<SUB>2</SUB>O<SUB>3</SUB> 18.20, Y<SUB>2</SUB>O<SUB>3</SUB> 0.72, Σ Ln<SUB>2</SUB>O<SUB>3</SUB> 1.70, FeO 0.97, MnO 0.54, Nb<SUB>2</SUB>O<SUB>5</SUB> trace, Ta<SUB>2</SUB>O<SUB>5</SUB> 9.96, Al<SUB>2</SUB>O<SUB>3</SUB> 3.02, CaO 1.72, TiO<SUB>2</SUB> 0.83, SiO<SUB>2</SUB> 58.31, and H<SUB>2</SUB>O 4.20; total 100.17%. This sample contained tantalite 11.47, anorthite 8.37, rutile 0.83, and quartz 37.91% in addition to thortveitite 37.40%. Scandium-tantalum substitution is suggested to occur similarly to yttrium-niobium substitution in earth acid minerals.

• 公益社団法人 日本化学会の論文

著者

• Nishikawa Yasuharu

  Department Of Chemistry Faculty Of Science And Technology Kinki University

• Moriyasu Kazuhisa

  Department of Chemistry, Faculty of Science and Technology, Kinki University

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