Iwashiroite-(Y), YTaO_4, a new mineral from Suishoyama, Kawamata Town, Fukushima Prefecture, Japan

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概要

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• Iwashiroite-(Y), YTaO4, was found from Suishoyama, Kawamata Town, Fukushima Prefecture, Japan. It is monoclinic, 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) Å3, 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, (Y0.81Yb0.05Dy0.04Er0.03Gd0.02Lu0.01Ho0.01Sm0.01Ca0.01Tm0.01)Σ1.00(Ta0.58Nb0.39Ti0.02)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).

• 2006-08-01

著者

• 横山 一己

  国立科博・地学

• MATSUBARA Satoshi

  Department of Geology and Paleontology, National Museum of Nature and Science

• MIYAWAKI Ritsuro

  Department of Geology and Paleontology, National Museum of Nature and Science

• Shimizu Masaaki

  Department Of Earth Sciences Faculty Of Science Toyama University

• Matsubara Satoshi

  Department Of Geology And Paleontology National Museum Of Nature And Science

• Shigeoka Masako

  Department Of Geology And Paleontology National Museum Of Nature And Science

• Miyawaki R

  Department Of Geology And Paleontology National Museum Of Nature And Science

• Miyawaki Ritsuro

  Department Of Geology And Paleontology National Science Museum

• Kobayashi Toshinori

  Funehiki High School

• Yokoyama Kazumi

  Department Of Geology And Paleontology National Museum Of Nature And Science

• Yokoyama Kazumi

  Dep. Of Geology And Paleontology National Museum Of Nature And Sci.

• HORI Hidemichi

  Hori Mineralogy Ltd.

• Miyawaki Ritsuro

  Department Of Geology And Paleontology National Museum Of Nature And Science

• Hori Hidemichi

  Hori Mineralogy

• Hirano Hideo

  Aist Tsukuba

• Shimizu Masaaki

  Department of Chemistry, Faculty of Science, Nagoya University

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