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Iron in the minerals of the sodalite group


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+++.

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Brousse, R., Varet, J. & Bizouard, H. Iron in the minerals of the sodalite group. Contr. Mineral. and Petrol. 22, 169–184 (1969). https://doi.org/10.1007/BF00387951

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  • Iron
  • Mineral Resource
  • Statistical Study
  • Electron Microprobe
  • Black Coloration