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Anandite, a new barium iron silicate from Wilagedera, North Western Province, Ceylon

Published online by Cambridge University Press:  14 March 2018

D. B. Pattiaratchi ,
Esko Saari  and
Th. G. Sahama
D. B. Pattiaratchi
Affiliation:
Geological Survey Department, Ceylon
Esko Saari
Affiliation:
University of Helsinki, Finland
Th. G. Sahama
Affiliation:
University of Helsinki, Finland
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Summary

Anandite is a new barium iron silicate found in the magnetite ore zone of the Wilagedera iron ore body, in the North Western Province of Ceylon. The mineral is named after the late Dr. Ananda Coomaraswamy, the first director of the Mineral Survey of Ceylon.

Anandite is monoclinic, with a 5·412, b 9·434, c 19·953 Å, β 94° 52′, space group C2/c. D 3·94, hardness 3–4. Optically positive, b ‖ β, γ ∧ a 12°, β 1·855, γ > 1·88. Pleochroism: β green, γ brown. Chemical composition corresponds to the simplified formula (Ba,K) (Fe,Mg)a (Si,Al,Fe)4O10 (O,OH)2 with Z = 2. The data available indicate that the mineral has the trioctahedral structure of the brittle micas.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 36 , Issue 277 , March 1967 , pp. 1 - 4
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1967

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References

Fernando, (L. J. D.), 1958 and 1960. Administration Reports of the Government Mineralogist, pp. R. 28 and R. 32, respectively.Google Scholar
Fernando, (L. J. D.), Administration Report of the Director, Geological Survey, for 1961-62, pp. R. 26 and R. 27.Google Scholar
Pattiaratchi, (D. B.), 1961. Some aspects of the genesis of iron ores in Ceylon (Abstract), Proc. 17th Ann. Sess. Ceylon Assn. Adv. Sci.Google Scholar