Miyahisaite, (Sr,Ca)2Ba3(PO4)3F, a new mineral of the hedyphane group in the apatite supergroup from the Shimoharai mine, Oita Prefecture, Japan

• NISHIO-HAMANE Daisuke

  The Institute for Solid State Physics, the University of Tokyo

• OGOSHI Yukikazu

  Departments of Earth Science, Faculty of Science, Ehime University

• MINAKAWA Tetsuo

  Departments of Earth Science, Faculty of Science, Ehime University

書誌事項

タイトル別名

• Miyahisaite, (Sr,Ca)₂Ba₃(PO₄)₃F, a new mineral of the hedyphane group in the apatite supergroup from the Shimoharai mine, Oita Prefecture, Japan

抄録

Miyahisaite, (Sr,Ca)₂Ba₃(PO₄)₃F, a new mineral of the hedyphane group in the apatite supergroup, is found in the Shimoharai mine, Oita Prefecture, Japan. Miyahisaite is colorless and occurs as a pseudomorphic aggregate (up to about 100 μm in size) along with fluorapatite in the quartz matrix in a namansilite-rich layer of the chert. Its hardness is 5 on the Mohs scale, and its calculated density is 4.511 g/cm³. The empirical formula of miyahisaite is (Sr_1.366Ca_0.717)_Σ2.083Ba_2.911P_3.002O₁₂(F_0.898OH_0.088Cl_0.014)_Σ1.00, which is representatively shown as (Sr,Ca)₂Ba₃(PO₄)₃F. Its simplified ideal formula is written as Sr₂Ba₃(PO₄)₃F, which requires 23.25 wt% SrO, 51.62 wt% BaO, 23.89 wt% P₂O₅, 2.13 wt% F, and -0.90 wt% F = O, for a total of 100.00 wt%. The mineral is hexagonal with a space group P6₃/m, unit cell parameters a = 9.921 (2) Å, c = 7.469 (3) Å, and V = 636.7 (3) ų, and Z = 2. The eight strongest lines in the powder XRD pattern [d (Å), (I/I₀), hkl] are 3.427 (16) 102, 3.248 (22) 120, 2.981 (100) 121, 2.865 (21) 300, 1.976 (23) 123, 1.874 (16) 140, 1.870 (15) 004, and 1.864 (17) 402. The mineral was formed by the reaction between fluorapatite and the Ba-bearing fluid that produced the aegirine-rich layer with hydrous Ba-rich minerals during the late-stage activity.

収録刊行物

• Journal of Mineralogical and Petrological Sciences

  Journal of Mineralogical and Petrological Sciences 107 (3), 121-126, 2012

  一般社団法人　日本鉱物科学会

キーワード

• Miyahisaite
• New mineral
• Hedyphane group
• Apatite supergroup
• Shimoharai mine

詳細情報

• CRID: 1390001206546009216
• NII論文ID: 10030499194
• NII書誌ID: AA11460926
• DOI: 10.2465/jmps.110901
• BIBCODE: 2012JMPeS.107..121N
• COI: 1:CAS:528:DC%2BC38Xht1GitrvN
• ISSN: 13493825
• ISSN: 13456296
• 本文言語コード: en
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
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