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An investigation of two new minerals: rhodesite and mountainite

Published online by Cambridge University Press:  14 March 2018

J. A. Gard ,
H. F. W. Taylor  and
R. A. Chalmers
J. A. Gard
Affiliation:
Department of Chemistry, University of Aberdeen
H. F. W. Taylor
Affiliation:
Department of Chemistry, University of Aberdeen
R. A. Chalmers
Affiliation:
Department of Chemistry, University of Aberdeen
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Summary

Rhodesite, from Kimberley, S. Africa, has been examined by electron-microscope, X-ray, and other methods. The acicular crystals are orthorhombic, with a 23·8, b 6·54, c 7·05 Å.; elongation c, cleavage (100); unit-cell contents approximately (Ca,Na2,K2)8Si16O40.11H2O; optical properties α 1·502, β 1·505, γ 1·515; α = b, β = α, γ = c. With it occurs a similar but distinct fibrous mineral, which appears to be a new species for which the name mountainite is proposed; it is monoclinic, with a 13·51, b 13·10, c 13·51 Å., β 104° elongation b, cleavage (001); unit-cell contents approximately (Ca,Na2,K2)16Si32O80.24H2O; optical properties α 1·504, β 1·510, γ 1·519; β = b (elongation). Both rhodesite and mountainite show close similarities to the fibrous zeolites, mountainite in particular resembling thomsonite. The possible structural basis of these similarities is discussed.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 31 , Issue 239 , December 1957 , pp. 611 - 623
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1957

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References

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