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 [in Japanese] Strontianite formed in cavities of the Torinosu limestone in Sakawa-cho, Kochi Prefecture, Japan [in Japanese]
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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) Å<sup>3</sup>. The chemical compositions by EPMA analyses varies from SrCO<sub>3</sub> 79 mol%, CaCO<sub>3</sub> 20 mol%, FeCO<sub>3</sub> 1 mol% to SrCO<sub>3</sub> 80 mol%, CaCO<sub>3</sub> 19 mol%, FeCO<sub>3</sub>+MnCO<sub>3</sub> 1 mol%. Consequently, it was identified as calcian strontianite.
- Journal of Mineralogical and Petrological Sciences
Journal of Mineralogical and Petrological Sciences 90(8), 288-293, 1995-08-05
Japan Association of Mineralogical Sciences