Nigerite from Lixa, near Felgueiras, Douro Litoral province, Portugal
Published online by Cambridge University Press: 14 March 2018
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
References
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