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Minohlite, a new copper-zinc sulfate mineral from Minoh, Osaka, Japan

  • M. Ohnishi (a1), N. Shimobayashi (a2), D. Nishio-Hamane (a3), K. Shinoda (a4), K. Momma (a5) and T. Ikeda (a6)...

Abstract

Minohlite, a new copper-zinc sulfate mineral related to schulenbergite, was found in the oxidized zone of the Hirao mine at Minoh (Minoo) City, Osaka Prefecture, Japan. The mineral occurs in cracks in altered shale as rosette aggregates up to 100 m m in diameter, composed of hexagonal platy crystals up to 50 μm m in diameter and 10 μm m in thickness. The associated minerals are chamosite, muscovite, smithsonite, serpierite, ramsbeckite, 'limonite' and chalcopyrite. Minohlite has hexagonal (or trigonal) symmetry with unit-cell parameters of a = 8.2535(11), c = 8.1352(17) Å, V = 479.93(16) Å3 and Z = 1, and possible space groups P6, P , P6/m, P 22, P6mm, P 2m and P6/mmm (or P3, P3, P321, P3m1, P m1, P312, P31m and P 1m). The six strongest reflections in the powder X-ray diffraction pattern [d in Å (I) hkl] are 8.138 (20) 001; 4.128 (24) 110; 2.702 (100) 120; 2.564 (76) 121; 1.560 (43) 140; and 1.532 (24) 141. Electron microprobe analyses gave the following values (wt.%): CuO 37.18, ZnO 21.08, FeO 0.49, SO3 16.78, SiO2 0.44, and H2O 24.03 (by difference). The empirical formula, calculated on the basis of Cu + Zn + Fe + S + Si = 9 atoms per formula unit, is (Cu4.43Zn2.45Fe0.06)Σ6.94[(SO4)1.99(SiO4)0.07]Σ2.06(OH)9.64·7.81H2O, which leads a simplified formula of (Cu,Zn)7(SO4)2(OH)10·8H2O where Cu > Zn. The mineral is bluish-green and transparent with a pearly to vitreous lustre. The streak is pale green. Cleavage is perfect on {001}. The Mohs hardness number is less than 2. The calculated density is 3.28 g cm−3. The mineral is named after Minoh City, where it was discovered.

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References

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Matsuura, H., Kurimoto, C., Sangawa, A. and Bunno, M. (1995) Geology of the Hirone district. With Geological Sheet Map at 1:50,000. Geological Survey of Japan [in Japanese with English abstract].
Mumme, W.G., Sarp, H. and Chiappero, P.J. (1994) A note on the crystal structure of schulenbergite. Archives des Sciences (Gene`ve), 47, 117–124.
Ohnishi, M., Shirakami, M. and Yoshimura, T. (2001) Secondary minerals from the Hirao Old Mine, Onsen-cho, Minoo City, Osaka Prefecture, Japan. Chigaku Kenkyu, 50, 137–159. [in Japanese].
Ohnishi, M., Kobayashi, S. and Kusachi, I. (2002) Ktenasite from the Hirao mine at Minoo, Osaka, Japan. Journal of Mineralogical and Petrological Sciences, 97 (Sueno Issue), 185–189.
Ohnishi, M., Kobayashi, S., Kusachi, I., Yamakawa, J. and Shirakami, M. (2004) Ramsbeckite from the Hirao mine at Minoo, Osaka, Japan. Journal of Mineralogical and Petrological Sciences, 99, 19–24.
Ohnishi, M., Kusachi, I., Kobayashi, S. and Yamakawa, J. (2007a) Mineral chemistry of schulenbergite and its Zn-dominant analogue from the Hirao mine, Osaka, Japan. Journal of Mineralogical and Petrological Sciences, 102, 233–239.
Ohnishi, M., Kusachi, I. and Kobayashi, S. (2007b) Osakaite, Zn4SO4(OH)6·5H2O, a new mineral species from the Hirao mine, Osaka, Japan. The Canadian Mineralogist, 45, 1511–1517.
Ohnishi, M., Shimobayashi, N. and Miyawaki, R. (2010) Cu-rich schulenbergite from the Nii mine, Hyogo Prefecture, Japan. Abstracts for 2010 Annual Meeting of Japan Association of Mineralogical Sciences, p. 88.
Seto, Y., Nishio-Hamane, D., Nagai, T. and Sata, N. (2010) Development of a software suite on X-ray diffraction experiments. The Review of High Pressure Science and Technology, 20, 269–276. [in Japanese with English abstract].
von Hodenberg, R., Krause, W. and Täuber, H. (1984) Schulenbergit, (Cu,Zn)7(SO4,CO3)2(OH)10·3H2O, ein neues Mineral. Neues Jahrbuch für Mineralogie, Monatshefte, 17–24. [in German with English abstract].

Keywords

Minohlite, a new copper-zinc sulfate mineral from Minoh, Osaka, Japan

  • M. Ohnishi (a1), N. Shimobayashi (a2), D. Nishio-Hamane (a3), K. Shinoda (a4), K. Momma (a5) and T. Ikeda (a6)...

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