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Iyoite, MnCuCl(OH)3 and misakiite, Cu3Mn(OH)6Cl2: new members of the atacamite family from Sadamisaki Peninsula, Ehime Prefecture, Japan

Published online by Cambridge University Press:  02 January 2018

D. Nishio–hamane ,
K. Momma ,
M. Ohnishi ,
N. Shimobayashi ,
R. Miyawaki ,
N. Tomita ,
R. Okuma ,
A. R. Kampf  and
T. Minakawa
D. Nishio–hamane*
Affiliation:
Institute for Solid State Physics, the University of Tokyo, Kashiwa, Chiba 277-8581, Japan
K. Momma
Affiliation:
Department of Geology and Palaeontology, National Museum of Nature and Science, Tsukuba 305-0005, Japan
M. Ohnishi
Affiliation:
12-43 Takehana Ougi-cho, Yamashina-ku, Kyoto 607-8082, 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
N. Tomita
Affiliation:
Department of Earth Science, Faculty of Science, Ehime University, Matsuyama, Ehime 790-8577, Japan
R. Okuma
Affiliation:
Institute for Solid State Physics, the University of Tokyo, Kashiwa, Chiba 277-8581, Japan
A. R. Kampf
Affiliation:
Mineral Sciences Department, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA
T. Minakawa
Affiliation:
Department of Earth Science, Faculty of Science, Ehime University, Matsuyama, Ehime 790-8577, Japan
*
*E-mail: hamane@issp.u-tokyo.ac.jp
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Abstract

Two new members of the atacamite family were discovered recently in the Sadamisaki Peninsula, Ehime Prefecture, Japan. Iyoite, MnCuCl(OH)3, is an Mn-Cu ordered analogue of botallackite, while misakiite, Cu3Mn(OH)6Cl2, is an Mn-rich analogueof kapellasite. Both minerals occur in manganese ore crevices in close association with one another. Iyoite forms radial and dendritic aggregates consisting of pale green, bladed crystals. Misakiite commonly exists in emerald green, tabular, hexagonal crystals. The densities of iyoite andmisakiite were calculated to be 3.22 and 3.42 g cm–3 based on their empirical formulae and powder X-ray diffraction data. Under the same axial setting of botallackite, iyoite is monoclinic, space group P21/m, a = 5.717(2), b = 6.586(2), c= 5.623(3) Å, β = 88.45(3)° and V = 211.63(15) Å3. Misakiite is trigonal, space group P3m1, with a = 6.4156(4), c = 5.7026(5) Å and V = 203.27(3) Å3. The structures of both mineralsare classified as layer type and the two are closely related. These new minerals were formed by the reaction between seawater and naturally-occurring manganese ores including native copper. These minerals are challenging to produce synthetically. Misakiite was synthesized successfully usinga hydrothermal method, while iyoite could not be made.

Keywords

iyoitemisakiiteMn-Cu orderingatacamite familynew mineralscrystal structuresmineral synthesisSadamisaki PeninsulaEhime PrefectureJapan
Type
Research Article
Information
Mineralogical Magazine , Volume 81 , Issue 3 , June 2017 , pp. 485 - 498
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2017

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