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A CO3-bearing member of the hydroxylapatite–hydroxylellestadite series from Tadano, Fukushima Prefecture, Japan: CO3-SO4 substitution in the apatite–ellestadite series

Published online by Cambridge University Press:  02 January 2018

Y. Banno ,
R. Miyawaki ,
K. Momma  and
M. Bunno
Y. Banno*
Affiliation:
Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8567, Japan
R. Miyawaki
Affiliation:
Department of Geology and Paleontology, National Museum of Nature and Science, 4-1-1 Amakubo, Tsukuba, Ibaraki, 305-0005, Japan
K. Momma
Affiliation:
Department of Geology and Paleontology, National Museum of Nature and Science, 4-1-1 Amakubo, Tsukuba, Ibaraki, 305-0005, Japan
M. Bunno
Affiliation:
The University Museum, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
*
*E-mail: [email protected]
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Abstract

A CO-bearing member of the hydroxylapatite–hydroxylellestadite series occurs as a Si-rich part of a hydroxylapatite–hydroxylellestadite series mineral (hydroxylapatitess) in a skarn xenolith from Tadano, Fukushima Prefecture, Japan. Hydroxylapatitess is composed of Si-poor and Si-rich parts. The Si-poor part is F-rich hydroxylapatite. The infrared spectrum of the Si-rich part demonstrates the presence of B-type CO3. A representative analysis of the Si-rich part yielded the empirical formula Ca4.989[(PO4)1.315 (SiO4)0.848 (SO4)0.368(CO2.943)0.480]∑3.011(OH0.629 Cl0.264 F0.107)∑1.000 on the basis of 8 cations, assuming Si = S + C. There is a very strong inverse correlation between Si and P in both the Si-poor and Si-rich parts. These data indicate that the substitution mechanism (SO4,CO3)2– + (SiO4)4– = 2(PO4)3– probably occurs in hydroxylapatite ss. Therefore, it was concluded that the Si-rich part corresponds to a CO3-bearing hydroxylapatite–hydroxylellestadite series mineral with CO3 partially replacing SO4. Most of the Si-rich part shows CO3 > SO4 and its composition approaches Ca5(SiO4)1.5(CO3,SO4)1.5(OH,Cl,F).

Keywords

HydroxylapatiteHydroxylellestaditeSkarnCO3-SO4 SubstitutionVibrational SpectraTadanoJapan
Type
Research Article
Information
Mineralogical Magazine , Volume 80 , Issue 2 , April 2016 , pp. 363 - 370
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2016

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