Electronic Resource
Springer
Contributions to mineralogy and petrology
22 (1969), S. 169-184
ISSN:
1432-0967
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
Notes:
Abstract The study of the problem of the black coloration of feldspathoids of the sodalitic group (nosean, haüyne, sodalite) reveals iron as a main factor. A statistical study of the global compositions of these minerals proves that their enriching in Fe is accompanied by a decrease in Al, but also by an increase in Si. A substitution of Fe+++ to Al in the structure in the feldspathoids is suggested. The analysis with an electron microprobe confirms this hypothesis and allows us to state a fondamental difference between the formation of miaskitic phonolites rich in Fe++ and that of agpaitic phonolites rich in Fe+++.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00387951
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