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Mineralogy and Petrology

, Volume 110, Issue 6, pp 917–926 | Cite as

Bunnoite, a new hydrous manganese aluminosilicate from Kamo Mountain, Kochi prefecture, Japan

  • Daisuke Nishio-HamaneEmail author
  • Koichi Momma
  • Ritsuro Miyawaki
  • Tetsuo Minakawa
Original Paper
First Online:

Abstract

A new mineral, bunnoite, originating from Kamo Mountain in Ino, Kochi Prefecture, Japan, has been identified. Bunnoite occurs as veins and lenses in hematite-rich ferromanganese ore, is dull green in color, and forms foliated subhedral crystals up to 0.5 mm in length. Its hardness is 5½ on the Mohs scale and its calculated density is 3.63 g cm−3. The mineral is optically biaxial (+), with α = 1.709(1), β = 1.713(1), γ = 1.727(1) (white light), 2V meas = 54° and 2V calc = 57°. The empirical formula of bunnoite is (Mn2+ 5.36Mg0.27Fe2+ 0.25Fe3+ 0.11)Σ6.00(Al0.60Fe3+ 0.40)Σ1.00(Si5.89Al0.11)Σ6.00O18(OH)3, and its simplified ideal formula is written as Mn2+ 6AlSi6O18(OH)3. The mineral is triclinic P \( \overline{1} \), and the unit cell parameters refined from powder X-ray diffraction data are a = 7.521(5) Å, b = 10.008(8) Å, c = 12.048(2) Å, α = 70.46(5)°, β = 84.05(6)°, γ = 68.31(6)° and V = 793.9(9) Å3. The crystal structure of bunnoite has been solved by the charge flipping method in conjunction with single-crystal X-ray diffraction data and refined to R1 = 3.3 %. Bunnoite was found to have a layered structure with alternating tetrahedral and octahedral sheets parallel to the (\( \overline{1} \)11). The silicate tetrahedra form sorosilicate [Si6O18(OH)] clusters in the tetrahedral sheets, while the octahedra share edges to form continuous strips linked by [Mn2O8] dimers in the octahedral sheets. This mineral is classified as 9.BH according to the Nickel-Strunz system and has been named in honor of the Japanese mineralogist Michiaki Bunno (b. 1942).

Keywords

Bunnoite New mineral Hydrous manganese aluminosilicate Ferro-manganese deposit Crystal structure Kochi prefecture 
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Notes

Acknowledgments

The authors wish to thank Y. Tamura for acting as a guide at Kamo Mountain. The authors are also grateful to A. Kasatkin for providing a sample of akatoreite. Powder XRD and preliminary single-crystal XRD data were acquired at KEK (Proposal nos. 2013G540, 2014G173 and 2015G522). This work was supported by a Grant-in-Aid for Young Scientists B (Grant No. 15K17785) from the Japan Society for the Promotion of Science.

Supplementary material

710_2016_454_MOESM1_ESM.txt (62 kb)
ESM 1 (TXT 62 kb)

References

  1. Bayliss P (1983) Polytypes of pennantite. Can Mineral 21:545–547Google Scholar
  2. Burns PC, Hawthorne FC (1993) Edge–sharing Mn2+O4 tetrahedra in the structure of akatoreite, Mn2+ 9Al2Si8O24(OH)8. Can Mineral 31:321–329Google Scholar
  3. Fransolet AM (1978) Données nouvelles sur l'ottrélite d'Ottré, belgique. Bull Minéral 101:548–557Google Scholar
  4. Fransolet A, Abraham K, Sahl K (1984) Davreuxite: a reinvestigation. Am Mineral 69:777–782Google Scholar
  5. Lindemann W, Wogerbauer R, Berger P (1979) Die Kristallstruktur von Karpholith (Mn0.97Mg0.08FeII 0.07)(Al1.90FeIII 0.01)Si2O6(OH)4. Neues Jahrb Mineral Monatsh 1979: 282–287Google Scholar
  6. Minakawa T (2000) Akatoreite from iron-manganese deposit of Kamo Mountain in Kurosegawa zone. Abstracts with Programs of Annual Meeting of the Mineralogical Society of Japan, the Mineralogical Society of Japan, P15, 107Google Scholar
  7. Naumova IS, Pobedimskaya EA, Belov NV (1974) Crystal structure of carpholite MnAl2(Si2O6)(OH)4. Kristallografiya 19:1155–1160Google Scholar
  8. Palatinus L, Chapuis G (2007) SUPERFLIP – a computer program for the solution of crystal structures by charge flipping in arbitrary dimensions. J Appl Crystallogr 40:786–790CrossRefGoogle Scholar
  9. Peacor DR, Essene EJ, Simmons WB, Bigelow WC (1974) Kellyite, a new Mn-Al member of the serpentine group from Bald Knob, North Carolina, and new data on grovesite. Am Mineral 59:1153–1156Google Scholar
  10. Read PB, Reay A (1971) Akatoreite, a new manganese silicate from eastern Otago, New Zealand. Am Mineral 56:416–426Google Scholar
  11. Sahl K, Jones PG, Sheldrick GM (1984) The crystal structure of davreuxite, MnAl6Si4O17(OH)2. Am Mineral 69:783–787Google Scholar
  12. Seto Y, Nishio-Hamane D, Nagai T, Sata N (2010) Development of a software suite on X-ray diffraction experiments. Rev High Pressure Sci Technol 20:269–276Google Scholar
  13. Shanon RD (1976) Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides. Acta Cryst A32:751–767CrossRefGoogle Scholar
  14. Sheldrick GM (2008) A short history of SHELX. Acta Crystallogr A64:112–122CrossRefGoogle Scholar
  15. Smith WC, Bannister FA, Hey MH (1946) Pennantite, a new manganese-rich chlorite from Benallt mine, Rhiw, Carnarvonshire. Mineral Mag 27:217–220CrossRefGoogle Scholar
  16. Wakita K, Miyazaki K, Toshimitsu S, Yokoyama S, Nakagawa M (2006) Geology of the Ino district. Quadrangle Series, 1: 50,000, Geological Survey of Japan, AIST, 140 pGoogle Scholar

Copyright information

© Springer-Verlag Wien 2016

Authors and Affiliations

  • Daisuke Nishio-Hamane
    • 1
    Email author
  • Koichi Momma
    • 2
  • Ritsuro Miyawaki
    • 2
  • Tetsuo Minakawa
    • 3
  1. 1.Institute for Solid State PhysicsThe University of TokyoChibaJapan
  2. 2.Department of Geology and PaleontologyNational Museum of Nature and ScienceTsukubaJapan
  3. 3.Department of Earth Science, Faculty of ScienceEhime UniversityMatsuyamaJapan

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