Zaïrite in quartz veins from Ishidera area, Wazuka, Kyoto Prefecture, Japan

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  • MORIMITSU Yuma
    Department of Geology and Mineralogy, Graduate School of Science, Kyoto University
  • SHIROSE Yohei
    Department of Earth’s Evolution and Environment, Graduate School of Science and Engineering, Ehime University
  • ENJU Satomi
    The Kyoto University Museum, Kyoto University
  • TSURUTA Kenji
    Fine Art Division, Faculty of Fine Arts, Kyoto City University of Arts
  • SHIMOBAYASHI Norimasa
    Department of Geology and Mineralogy, Graduate School of Science, Kyoto University

Abstract

<p>Zaïrite was found from the quartz vein penetrating into the metamorphosed mudstone of the Wazuka Unit in Ishidera area, Wazuka–cho, Kyoto Prefecture, Japan, which is the first occurrence in Japan. Zaïrite occurs as bright–yellow granular crystals (20–30 µm) in a cavity formed by the leaching of fluorapatite with native bismuth inclusion. The chemical composition of zaïrite from Ishidera was closer to the ideal chemical composition, comparing with the zaïrite from type locality including Al. The empirical formula from electron probe microanalyzer (EPMA) analysis on the basis of O = 8, OH− = 6 was (Bi0.70Ca0.23)Σ0.93Fe3+2.91(P2.04S0.09O8)(OH)6. The unit cell parameters obtained from the X–ray diffraction (XRD) pattern were a = 7.311(3) Å and c = 16.407(7) Å, larger than the type locality due to difference in chemical composition.</p>

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