高知県佐川町鳥巣石灰岩の空孔中に生成するストロンチアン石

書誌事項

タイトル別名
  • Strontianite formed in cavities of the Torinosu limestone in Sakawa-cho, Kochi Prefecture, Japan.
  • コウチケン サカワチョウ トリノス セッカイガン ノ クウコウチュウ ニ セイ

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抄録

Strontianite was found as authigenic mineral in cavities in Torinosu limestone, Sakawa-cho, Kochi Prefecture, forming fibrous and needle forms up to 5 mm in length, often radial globular aggregates on calcite. It is closely associated with dolomite, fluorite, barite and rarely celestine, colorless to pale yellow with vitreous luster. The refractive indices are α=1.520, γ=1.666, γ−α=0.146. Unit cell parameters are a=5.088 (5), b=8.340 (9), C=5.966 (7) Å, V=253.1 (8) Å3. The chemical compositions by EPMA analyses varies from SrCO3 79 mol%, CaCO3 20 mol%, FeCO3 1 mol% to SrCO3 80 mol%, CaCO3 19 mol%, FeCO3+MnCO3 1 mol%. Consequently, it was identified as calcian strontianite.

収録刊行物

  • 岩鉱

    岩鉱 90 (8), 288-293, 1995

    一般社団法人 日本鉱物科学会

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