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Nahcolite (NaHCO3) in inclusions in apatites from some E. African ijolites and carbonatites

Published online by Cambridge University Press:  05 July 2018

A. H. Rankin  and
M. J. Le Bas
A. H. Rankin
Affiliation:
Department of Geology, University of Leicester, LE1 7RH
M. J. Le Bas
Affiliation:
Department of Geology, University of Leicester, LE1 7RH
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Summary

Nahcolite (NaHCO3) is identified and recorded for the first time from an igneous rock. Often associated with it is another carbonate mineral tentatively identified as kalicine (KHCO3), which has not previously been recorded as a primary mineral in any rock. These minerals occur in inclusions in apatite crystals in ijolites and carbonatites, and indicate that both ijolite and carbonatite magma must have been considerably richer in soda and potash than is indicated by the chemical analyses of the rocks. The identification was made by a combination of microchemical, solubility, crystallographic, and optical determinations.

Type
Research Article
Information
Mineralogical Magazine , Volume 39 , Issue 305 , March 1974 , pp. 564 - 570
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1974

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