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Nigerite from Lixa, near Felgueiras, Douro Litoral province, Portugal

Published online by Cambridge University Press:  14 March 2018

R. Van Tassel
R. Van Tassel*
Affiliation:
Institut royal des Sciences naturelles de Belgique
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Summary

Nigerite occurs in pegmatite as hexagonal crystals enclosed in mica or in association with lithiophilite, apatite and vivianite. Absolute hexagonal parameters are a 5·67 and c 13·88 Å. Powder data are given. Forms and present besides the well-developed {0001}. Density 4·25. Refractive index 1·80, birefringence about 0·005, negative optical character. The chemical composition is studied by means of chemical, X-ray fluorescence and optical spectrography methods.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 34 , Issue 268 , 1965 , pp. 482 - 486
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1965

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References

Banni, Ster (F. A.), Hey, (M.H.) and Stadler, (H.P.), 1947. Min. Mag., vol. 28, p. 129.Google Scholar
Ginzberg, (A.I.), Nazarova, (A.S.), and Sukhomazova, (L.L.), 1961 (translation 1963, New York). In,New data on rare element mineralogy, p. 42.Google Scholar
Jacobson, (R.), and Webb, (J.S.), 1947. Min. Mag., vol. 28, p. 118.Google Scholar