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Manganhumite, a new species

Published online by Cambridge University Press:  05 July 2018

Paul Brian Moore
Paul Brian Moore*
Affiliation:
Department of the Geophysical Sciences, The University of Chicago, Chicago, Illinois 60637, U.S.A.
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Summary

Manganhumite, orthorhombic, a 10·54(1), b 21·45(2), c 4·822(9) Å, space group Pnma, Z = 4, (Mn0·68Mg0·30Fe0·01Ca0·01)7(OH)2(SiO4)3, is the manganese analogue of humite whose type locality is the Brattfors mine, Nordmark, Province of Värmland, Sweden. It is a skarn assemblage mineral and occurs with katoptrite, manganostibite, magnussonite, galaxite, etc., which replace manganosite grains in magnetite-manganosite ore.

The mineral is biaxial (+), α = 1·707(3), β = 1·712(3), 7 = 1·732(3), 2V7(obs.) = 37(4)° r > v perceptible, cleavage {010} perfect, hardness = 4, specific gravity = 3·83(5). The five strongest powder lines are 1·777(10), 2·500(7), 3·371(6), 2·628(6), and 1·525(6).

Type
Research Article
Information
Mineralogical Magazine , Volume 42 , Issue 321 , March 1978 , pp. 133 - 136
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1978

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References

Geijer, (P.) and Magnusson, (N. H.), 1944. De Mellan-svenska Järnmalmernas Geologi. Sveriges Geol. Under-sökning Ser. Ca. (No. 35), 196.Google Scholar
Moore, (P. B.), 1970. Mineral. Record, 1, 154.Google Scholar
Ribbe, (P. H.) and Gibbs, (G. V.), 1971. Am. Mineral. 56, 1555.Google Scholar
Sjögren, (Hj.), 1885. Z. Krystallogr. Mineral. 10, 113.Google Scholar