Iwashiroite-(Y), YTaO4, a new mineral from suishoyama, kawamata town, Fukushima prefecture, Japan

• HORI Hidemichi

  Hori Mineralogy Ltd.

• Kobayashi Toshinori

  Funehiki High School

• MIYAWAKI Ritsuro

  Department of Geology, National Science Museum

• MATSUBARA Satoshi

  Department of Geology, National Science Museum

• YOKOYAMA Kazumi

  Department of Geology, National Science Museum

• SHIMIZU Masaaki

  Department of Earth Sciences, Faculty of Science, Toyama University

書誌事項

タイトル別名

• Iwashiroite-(Y), YTaO₄, a new mineral from Suishoyama, Kawamata Town, Fukushima Prefecture, Japan

抄録

Iwashiroite-(Y), YTaO₄, was found from Suishoyama, Kawamata Town, Fukushima Prefecture, Japan. It is monoclinic</i>, P2/a, a = 5.262(5) Å, b = 5.451(5) Å, c = 5.110(5) Å, β = 95.12(10)°, V = 146.0(2) ų, Z = 2. The five strongest lines in the powder XRD pattern [d(Å), I/I₀, hkl] are (3.13, 100, 111), (2.95, 94, 111), (2.73, 26, 020), (1.890, 29, 220) and (1.862, 29, 022). Electron microprobe analysis gave; Y₂O₃ 29.10, Ce₂O₃ 0.10, Nd₂O₃ 0.10, Sm₂O₃ 0.36, Gd₂O₃ 1.06, Tb₂O₃ 0.25, Dy₂O₃ 2.38, Ho₂O₃ 0.56, Er₂O₃ 2.09, Tm₂O₃ 0.37, Yb₂O₃ 3.33, Lu₂O₃ 0.85, ThO₂ 0.02, UO₂ 0.15, CaO 0.17, Ta₂O₅ 40.64, Nb₂O₅ 16.66, TiO₂ 0.41, total 98.60 wt%, and leads to the empirical formula, (Y_0.81Yb_0.05Dy_0.04Er_0.03</sub>Gd_0.02Lu_0.01Ho_0.01Sm_0.01Ca_0.01Tm_0.01)_Σ1.00(Ta_0.58Nb_0.39T_i0.02)_Σ0.99O₄ on the basis of the 4 oxygen atoms per formula unit. Iwashiroite-(Y) is translucent and amber brown to brown in color with a glassy to subadamantine luster. The streak is pale brown and cleavage is {010} good, {001} poor. The Mohs' hardness is 6. The calculated density is 7.1 g/cm³. Iwashiroite-(Y) occurs as an aggregate of small euhedral platy crystals with a metamict substance in the main ore body of the granite pegmatite mine at the locality. Associated minerals are quartz, microcline and annite. The crystal structure was refined to R = 0.034 with single crystal XRD data. Although the structure consists of TaO₆ octahedra and YO₈ polyhedra, iwashiroite-(Y) is not isostructural with fergusonite-beta-(Y).

収録刊行物

• Journal of Mineralogical and Petrological Sciences

  Journal of Mineralogical and Petrological Sciences 101 (4), 170-177, 2006

  一般社団法人　日本鉱物科学会

キーワード

• Iwashiroite
• New mineral
• Yttrium
• Tantalum
• Suishoyama

詳細情報

• CRID: 1390001206546552832
• NII論文ID: 10017532566
• NII書誌ID: AA11460926
• DOI: 10.2465/jmps.101.170
• BIBCODE: 2006JMPeS.101..170H
• COI: 1:CAS:528:DC%2BD28XhtVyqurbJ
• ISSN: 13493825
• ISSN: 13456296
• Web Site: https://www.jstage.jst.go.jp/article/jmps/101/4/101_4_170/_pdf
• 本文言語コード: en
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