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Mpororoite and anthoinite from the Kara mine, Tasmania

Published online by Cambridge University Press:  05 July 2018

Satoshi Matsubara ,
Akira Kato  and
Kozo Nagashima
Satoshi Matsubara
Affiliation:
Department of Geology, National Science Museum, 3-23-1 Hyakunin-cho, Shinjuku, Tokyo 160, Japan
Akira Kato
Affiliation:
Department of Geology, National Science Museum, 3-23-1 Hyakunin-cho, Shinjuku, Tokyo 160, Japan
Kozo Nagashima
Affiliation:
Department of Chemistry, The University of Tsukuba, Sakura-mura, Ibaraki 305, Japan
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Abstract

The first occurrence of mpororoite and anthoinite outside the African Continent has been found in an altered skarn from the Kara mine, Tasmania, forming a white powdery mixture of the two minerals pseudomorphing scheelite. The wet chemical analysis of the mixture shows WO3, Al2O3, and H2O to be the essential constituents, proving the non-essential nature of Fe2O3 in mpororoite; the original mpororoite contained high Fe2O3 substituting for Al2O3. The thermal treatment of the mixture at 100°C for 6 hours in air brings about the conversion of mpororoite into anthoinite, which re-hydrates into mpororoite, although the associated anthoinite does not. The source of Al is ascribed to the decomposition of aluminian andradite in the skarn.

Type
Research Article
Information
Mineralogical Magazine , Volume 48 , Issue 348 , September 1984 , pp. 397 - 400
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1984

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References

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