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A reinvestigation of holotype wadalite from Tadano, Fukushima Prefecture, Japan

Published online by Cambridge University Press:  15 May 2018

Yasuyuki Banno ,
Michiaki Bunno  and
Katsuhiro Tsukimura
Yasuyuki Banno*
Affiliation:
Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8567, Japan
Michiaki Bunno
Affiliation:
The University Museum, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
Katsuhiro Tsukimura
Affiliation:
Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8567, Japan
*
*E-mail: y-banno@aist.go.jp
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Abstract

A reinvestigation of the type specimen of wadalite, ideally Ca12Al10Si4O32Cl6, from Tadano, Fukushima Prefecture, Japan, reveals that it has well-defined chemical sector zoning. The mineral occurs in skarn xenoliths in two-pyroxene andesite and forms tris-tetrahedral crystals up to 1 mm in size. The mineral is cubic, I¯43d, with a = 12.009(2) Å, V = 1731.8(8) Å3 and Z = 2. The zoning is divided into two sectors, {21¯1} and {211}, on the basis of back-scattered-electron images. The {21¯1} sector is more enriched in Fe3+, Si, Mg and Cl, and depleted in Al than the {211} sector. The empirical formulae yielded by the averaged compositions for the {21¯1} and {211} sectors are: Ca12.01(Al7.88$\hbox{Fe}_{{\rm 0}{\rm. 99}}^{{\rm 3 +}} $Si4.51Mg0.56Ti0.05)Σ13.99O32.22Cl5.55 and Ca12.05(Al8.42$\hbox{Fe}_{{\rm 0}{\rm. 85}}^{{\rm 3 +}} $Si4.20Mg0.44Ti0.04)Σ13.95O32.19Cl5.38, respectively. Compositional variations in the wadalite grains suggest that the Si contents are controlled mainly by the substitution T(Al,Fe3+) + W□ ↔ TSi + W(Cl,F). The presence of sector zoning suggests that the wadalite grew during rapid non-equilibrium crystallization.

Keywords

wadalitesector zoningRaman spectroscopymayenite supergroupkatoiteskarnTadanoJapan
Type
Article
Information
Mineralogical Magazine , Volume 82 , Issue 5 , October 2018 , pp. 1023 - 1031
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2018 

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Footnotes

Associate Editor: Ian Graham

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