- 著者
- Hidemichi HORI Eiji KOYAMA Kozo NAGASHIMA
- 出版者
- Japan Association of Mineralogical Sciences
- 雑誌
- Mineralogical Journal (ISSN:05442540)
- 巻号頁・発行日
- vol.10, no.7, pp.333-337, 1981 (Released:2007-03-31)
- 参考文献数
- 11
- 被引用文献数
- 10
Kinichilite, a new mineral from the Kawazu mine, is hexagonal with a=9.419 Å, c=7.666 Å, space group P63 or P63⁄m. The empirical formula derived from the chemical analysis is: (Fe2+1.13Mg0.47Zn0.43Mn2+0.17)Σ2.20(Te2.97Se0.03)Σ3.00 O9.00(H1.38Na0.22)Σ1.60·3.2H2O, corresponding to Fe2+ dominant analogue of zemannite.It is dark brown in colour. Subadamantine luster and brown streak. No cleavage. Density (calc.) 3.96 g/cm3 from normalized empirical formula and Z=2.
- 著者
- Tohru OZAWA Akihiro SAITOW Hidemichi HORI
- 出版者
- Japan Association of Mineralogical Sciences
- 雑誌
- Mineralogical Journal (ISSN:05442540)
- 巻号頁・発行日
- vol.20, no.4, pp.179-187, 1998 (Released:2007-03-31)
- 参考文献数
- 14
- 被引用文献数
- 1 1
Giessenite was reported as an acicular crystal that shared a close association with Sb-bearing cosalite from the Otome mine, Yamanashi Prefecture (Ozawa and Hori, 1982). Recent criteria classify it as izoklakeite.The Otome izoklakeite, which is orthorhombic (Pnnm or Pnn2 from its orthogonal lattice and systematic extinction, in agreement with previous reports), has unit-cell dimensions of a 34.067, b 38.085, c 4.056Å. In addition, diffuse reflections which double the periodicity of 4.056Å along the c-axis are observed, also in agreement with the report on Vena izoklakeite (Zakrzewski and Makovicky, 1986).An electron microprobe analysis gives Cu 0.8, Fe 0.3, Ag 1.1, Pb 46.5, Bi 27.2, Sb 7.3, S 16.2, total 99.4wt.%, yielding the empirical formula (Cu2.7Fe1.2)3.9Ag2.2Pb48.7(Bi28.2Sb13.0)41.2S109.7, assuming the total cation=96 in a unit cell. It has a Sb/(Sb+Bi) value of 0.316, and is the most Bi-rich of the known izoklakeites.
1 0 0 0 OA Iwashiroite-(Y), YTaO4, a new mineral from Suishoyama, Kawamata Town, Fukushima Prefecture, Japan
- 著者
- Hidemichi HORI Toshinori Kobayashi Ritsuro MIYAWAKI Satoshi MATSUBARA Kazumi YOKOYAMA Masaaki SHIMIZU
- 出版者
- 一般社団法人日本鉱物科学会
- 雑誌
- Journal of Mineralogical and Petrological Sciences (ISSN:13456296)
- 巻号頁・発行日
- vol.101, no.4, pp.170-177, 2006 (Released:2006-08-08)
- 参考文献数
- 23
- 被引用文献数
- 4 8
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).