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MINERALOGICAL ABSTRACTS from SCIENTIFIC PAPERS PUBLISHED in JAPAN, Edited by the Abstracting Committee, Japan Association of Mineralogical Sciences*

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MINERALOGICAL ABSTRACTS from SCIENTIFIC PAPERS PUBLISHED in JAPAN, Edited by the Abstracting Committee, Japan Association of Mineralogical Sciences* Journal of Mineralogical and Petrological Sciences, Volume 106, page 267-272, 2011 267 MINERALOGICAL ABSTRACTS FROM SCIENTIFIC PAPERS PUBLISHED IN JAPAN, Edited by the Abstracting Committee, Japan Association of Mineralogical Sciences* New Minerals and Mineral Description 106082―106095; 106084 Nitta, E., Kimata, M., Hoshino, M., Echigo. T., Rock-Forming Minerals and Petrology Hamasaki, S., Nishida, N., Shimizu, M. & Akasaka, T. Metamorphic Rocks 106096―106103; Crystal chemistry of ZnS minerals formed as high- temperature volcanic sublimates: matraite identical with Fluid Inclusions 106104―106107; sphalerite. J. Mineral. Petrol. Sci., 103, 145-151, 5 figs., 3 Analytical Methods 106108―106110 tables, 2008. By means of single crystal XRD, EMP, micro XRD and mi- New Minerals and Mineral Description cro-Raman scattering analyses, the crystal chemistry of ZnS min- 106082 Matsubara, S., Mouri, T., Miyawaki, R., Yokoyama, K. erals formed as high-temperature volcanic sublimates from Iwo­ & Nakahara, M. Munakataite, a new mineral from the dake volcano, Satsuma-Iwojima, Japan, was investigated in detail. Kato mine, Fukuoka, Japan. J. Mineral. Petrol. Sci., 103, They were identified as sphalerite and matraite by using a four- 327-332, 3 figs., 3 tables, 2008. circle automated X-ray diffractometer. However, the two minerals 4+ Munakataite, Pb2Cu2(Se O3)(SO4)(OH)4, occurs as a thin coa­ were virtually the same in XRD pattern, chemical composition ting on a fracture in a quartz vein containing Cu-Zn-Pb-Ag-Au and micro-Raman scattering spectrum. Close examination of the ore minerals in the Kato mine, Munakata City, Fukuoka observed reflection for the matraite sample showed that all reflec- Prefecture, Japan. It is monoclinic with the space group P21/m and tions can be identified as reflections from (001)-twinned matraite, lattice parameters a 9.766(8), b 5.666(5), c 9.291(10) Å, β and they were completely identical with the reflections from (111) 102.40(8)°, V 502.1 Å3, and Z 2. An electron microprobe analysis twinned sphalerite. It is evident that matraite is not a distinct min- 4+ gave the empirical formula as Pb2.03(Cu1.94Ca0.01)Σ1.95(Se O3)1.00(SO4) eral species, but can be treated as (111) twinned sphalerite. 1.02(OH)3.92 on the basis of Pb + Cu + Ca + Se + S = 6 apfu and the (I. Sunagawa) calculated (OH) with a charge balance. Munakataite is a member of the linarite-chenite group, and it is the first selenite mineral in 106085 Sugawara, H., Sakakibara, M., Belton, D. & Suzuki, T. Japan, corresponding to a (SO4)-dominant analogue of schmie- Quantitative micro-PIXE analysis of heavy-metal-rich derite. The mineral occurs as light-bluish aggregates composed of framboidal pyrite. J. Mineral. Petrol. Sci., 103, 131-134, 3 minute fibrous crystals up to 30 μm long. The calculated density is figs., 2008. 3 5.526 g/cm , and Mohs hardness is less than 2. Micro-PIXE analysis was applied to measure the concentra- (Authors’ abstract) tions of heavy metals in framboidal pyrite from drill core samples of mudstone from the Late Cretaceous Hakobuchi Group, central 106083 Minakawa, T., Fukushima, H., Nishio-Hamane, D. & Hokkaido. Smaller framboidal pyrite with diameters less than 10 +3 Miura, H. Epidote-(Sr),CaSrAl2Fe (Si2O7)(SiO4)(OH), a μm and larger ones with diameter from 15 to 50 μm show different new mineral from the Ananai mine, Kochi Prefecture, tendency. Higher concentrations of As are observed in most of Japan. J. Mineral. Petrol. Sci., 103, 400-406, 5 figs., 5 larger types. Higher concentrations of Pb generally occur as iso- tables, 2008. lated islands within smaller framboids, connecting along the rim +3 Epidote-(Sr), CaSrAl2Fe (Si2O7)(SiO4)(OH), the Sr analog of of polyframboids. The observed difference is considered as due to epidote, was found in the Nagakawara and Hohnomori deposits at contrasting formation processes in two different types. the Ananai mine, Kochi Prefecture, Japan. It occurs in the form of (I. Sunagawa) prismatic crystals up to 1 cm in length in the tinzenite veins or the fine crystal aggregates in piemontite breccia. Epidote-(Sr) is opti- 106086 Abdalla, H. M., Matsueda, H., Obeido, M. A. & Taka- cally biaxial negative, α = 1.737(2), β = 1.780(2), γ = 1.792(2), and hashi, R. Chemistry of cassiterite in raw metal gra nitoids 2Vcalc =62° and has perfect cleavage parallel to {001}. It exhibits and the associated rocks in the Eastern Desert, Egypt. J. pleochroism-X: pale greenish yellow, and Y and Z: pale reddish Mineral. Petrol. Sci., 103, 318-326, 5 figs., 1 table, 2008. brown to brownish pink. Its calculated density is 3.74 g/cm3, and it Cassiterite of metasomatized alkali feldspar granites (apo- has a Mohs’ hardness of 6.5. The representative empirical formula granites) is characterized by enhanced to moderate Nb, Ta (with * of epidote-(Sr) from the Nagakawara deposit is (Ca1.10Sr0.90) high Nb/Ta ratios), Ti, FeO and lower Ga2O3 (< 0.01 wt %), and 3+ 3+ Σ2.00(Al1.92 Fe 0.87Mn0.20)Σ2.99Si3.01O12(OH) on the basis of OH = 1 and also by the development of deep brown to dark brown pleochroic O = 12 per formula unit. The mineral monoclinic with a space color zones which oscillate or progressively alternate with lighter group of P21/m, a 8.928(5), b 5.652(1), c 10.244(5) Å, β 114.46(4)°, color zones. In contrast, cassiterite in the lithium albite granite is 3 * V 470.5(3) Å , and Z 2. The strongest seven lines in the X-ray enriched in Ta, Nb (with low Nb/Ta ratio), Ti, FeO and Ga2O3, powder diffraction pattern [d in Å (I/I0)(hkl) were 2.92 (100) (11- 0.01 ~0.04%), and by deep-orange to reddish brown pleochroic 3), 2.58 (49) (202), 3.50 (42) (21-1), 2.61 (42) (31-1), 2.72 (41) (013), core or bands which alternate with lighter color bands. These char- 2.83 (32) (020), and 3.26 (23) (201). Epidote-(Sr) from the acteristic differences between the two can be used as a valuable Nagakawara deposit may have been formed from the residual hy- exploration tool for prospecting primary cassiterite mineraliza- drothermal fluid after the crystallization of tinzenite. tion. (I. Sunagawa) (Authors’ abstract) 106087 Minakawa, T. & Dehara, M. Delafossite from the oxi- dation zone of the Besshi ore deposit. Japan. Mag. Mineral. *Abstracting Committee Petrol. Sci., 37, 91-95, 2 figs., 2 tables (in Japanese with I. Sunagawa (Chairman and Editor) English abstract), 2008. R. Miyawaki (Technical Editor) Delafossite, CuFeO2, occurs as botryoidal aggregates in small M. Arima, Y. Banno, T. Hokada, K. Kihara, T. Minakawa, cavities and as crusts filling cracks of oxidized zone of the Besshi H. Miura, T. Mizuta, T. Morishita, T. Nagase, T. Noguchi, ore deposit, embedded in Sambagawa metamorphic rocks, situated F. Ohashi, M. Ohkawa, E. Ohtani, K. Onuma, T. Takagi, at the central Shikoku, Japan. Associated supergene minerals are K. Tomita, K. Tsukamoto, S. Uehara, J. Yamakawa native copper, cuprite, malachite, brochantite, chrysocolla, cu- 268 proallophane, hematite and goethite. It is black with submetallic 106090 Mashima, H. & Akai, J. Four-layer orthorhombic poly- luster, opaque, and pale yellowish white color in reflected light. type (4O) in strontio-joaquinite group minerals found in The unit cell parameters are a 3.020(5) and c 17.17(3) Å. It is the Ohmi region, central Japan. J. Mineral. Petrol. Sci., chemically characterized by relatively high Zn content up to 9.9 103, 407-411, 3 figs., 1 table, 2008. wt% as ZnO. The empirical formulae with highest and lowest Zn A new polytype (4O), mainly comprising a 2O polytype was content are (Cu0.89Zn0.11)Σ1.00(Fe0.88Zn0.07Al0.03Ti0.01)Σ0.99O2 and (Cu0.91 identified by TEM in mineral grains of (Sr)-orthojoaquinite [Sr2B 2+ Zn0.09)Σ1.00(Fe0.95Zn0.01Al0.01)Σ0.97O2, respectively. The general for- a2(Na,Fe )2Ti2Si8O24(O,OH)·H2O] occurring in the Ohmi-Itoi­ 1+ 2+ 3+ 2+ 1+ mula can be expressed as (Cu1−xZnx )(Fe1−xZnx )O2 or (Cu1−x gawa district, Japan, in addition to previously reported monoclinic 2+ 3+ Znx )(Fe1−x□x/3)O2. The mineral was formed by the decomposition (1M) and orthorhombic (2O) polytypes. The 4O polytype was also of chalcopyrite ore associated with a small amount of sphalerite found in mineral grains with the 1M polytype. The TEM observa- under the supergene environments. (I. Sunagawa) tion revealed that the 4O polytype appeared as interstratified bands having a width of ~ 8 μm that were embedded parallel to the 106088 Sato, E., Nakai, I., Terada, Y., Tsutsumi, Y., Yokoyama, (001) plane in the 2O crystal grains. The unit cell parameters are 3 K., Miyawaki, R. & Matsubara, S. Study of Zn-bearing approximately a 10.6, b 9.8, c 44.2 Å, V 4591.5 Å , and Z 8. beaverite Pb(Fe2Zn)(SO4)2(OH)6 obtained from Mikawa HRTEM imaging showed that a unit cell of the 4O polytype can mine, Niigata Prefecture, Japan. J. Mineral. Petrol. Sci., be interpreted as being identical to that of a superstructure having 103, 141-144, 4 figs., 3 tables, 2008. a repeated twinning of two times the size of the 1M unit cell on Zn bearing beaverite occurs as a secondary mineral in an oxi- the (001) plane. The formation mechanism is discussed. dized zone of a quartz vein in the hydrothermal Cu-Zn-Pb ore de- (I. Sunagawa) posit of the Mikawa mine, Niigata Prefecture, Japan. The Zn- bearing beaverite is dark brown in color with streaks and the 106091 Shimazaki, H., Miyawaki, R., Yokoyama, K., Matsu- associated minerals are quartz, galena, sphalerite, pyrite, angle- bara, S.
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