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Imayoshiite, Ca3Al(CO3)[B(OH)4](OH)6·12H2O, a new mineral of the ettringite group from Ise City, Mie Prefecture, Japan

Published online by Cambridge University Press:  02 January 2018

D. Nishio-Hamane ,
M. Ohnishi ,
K. Momma ,
N. Shimobayashi ,
R. Miyawaki ,
T. Minakawa  and
S. Inaba
D. Nishio-Hamane*
Affiliation:
Institute for Solid State Physics, the University of Tokyo, Kashiwa, Chiba 277-8581, Japan
M. Ohnishi
Affiliation:
12-43 Takehana Ougi-cho, Yamashina-ku, Kyoto 607-8082, Japan
K. Momma
Affiliation:
Department of Geology and Palaeontology, National Museum of Nature and Science, Tsukuba 305-0005, Japan
N. Shimobayashi
Affiliation:
Department of Geology and Mineralogy, Graduate School of Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan
R. Miyawaki
Affiliation:
Department of Geology and Palaeontology, National Museum of Nature and Science, Tsukuba 305-0005, Japan
T. Minakawa
Affiliation:
Department of Earth Science, Faculty of Science, Ehime University, Matsuyama, Ehime 790-8577, Japan
S. Inaba
Affiliation:
Inaba-Shinju Corporation, Minamiise, Mie 516-0109, Japan
*
*E-mail: hamane@issp.u-tokyo.ac.jp
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Abstract

Imayoshiite, Ca3Al(CO3)[B(OH)4](OH)6·12H2O, occurs in cavities in the altered gabbro xenolith in the sepentinized dunite exposed at Suisho-dani, Ise City, Mie Prefecture, Japan. Imayoshiite is colourless and transparent with a vitreous lustre and its aggregates are white with a silky lustre. Imayoshiite has a white streak. Its Mohs hardness is 2–3. It is brittle, the cleavage is distinct on {100} and the fracture is uneven. The mineral is uniaxial (–) with the indices of refraction ω = 1.497(2) and ε = 1.470(2) in white light. Imayoshiite is hexagonal, P63, a = 11.0264(11), c = 10.6052(16) Å by powder diffraction and a = 11.04592(2), c = 10.61502(19) Å by single-crystal diffraction. The structural refinement converged to R1 = 2.35%. Imayoshiite is the first member of the ettringite group with both CO3 and B(OH)4 anions.

Keywords

imayoshiitenew mineralettringite groupcrystal structureIseMie Prefecture
Type
Research Article
Information
Mineralogical Magazine , Volume 79 , Issue 2 , April 2015 , pp. 413 - 423
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2015

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