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Johnsomervilleite, a new transition-metal phosphate mineral from the Loch Quoich area, Scotland

Published online by Cambridge University Press:  05 July 2018

A. Livingstone
A. Livingstone*
Affiliation:
Department of Geology, Royal Scottish Museum, Chambers Street Edinburgh EH1 1JF
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Summary

Johnsomervilleite, Na10Ca6Mg18(Fe, Mn)25 (PO4)36 has Z = 3, a 15.00 Å, c 42.75 Å and cell volume 8330 Å3 and is a new rhombohedral species occurring in two metamorphic segregation pods in Moine gneiss of kyanite-sillimanite grade. Associated minerals are apatite, jahnsite, graftonite, mineral A, phosphosiderite, rockbridgeite, mitridatite, and vivianite. It is dark brown, brittle, and glassy, H = 4½, D = 3·35 (calc. 3.41) with a perfect basal (?) cleavage. Eight electron probe analyses are given and d spacings for 50 lines. The mineral, which is a Mg-Fe analogue of fillowite, is named after the late Mr J. M. Somerville who presented a specimen of garnet-quartz rock, which contained the new species, to the Royal Scottish Museum.

Type
Research Article
Information
Mineralogical Magazine , Volume 43 , Issue 331 , September 1980 , pp. 833 - 836
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1980

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References

Mandarino, (J. A.), Sturman, (B. D.), and Corlett, (M. I.), 1978. Can. Mineral. 16, 411-13 .Google Scholar
Moore, (P. B.), 1974. Am. Mineral. 59, 48–59.Google Scholar