Nefelinit

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Nefelinit

Nephelinite - a volatile, volcanic, porphyritic igneous rock that is rocky, rocky. Color black or dark gray, less light gray. Fenocrystals are represented mainly by titanium augites and nephelins; feldspars are not present. In some variants, quite a few (up to 7%) olivine (olivine nephelinite), sanidine (leucine nephelinite), monticellit (nephelinit monticellulite), meliline (melphalin nephelinite).

In Poland nephelinity is of the Cenozoic age and occurs mainly in Silesia. eg on the Mount St. Anna, within the Central European Basin Province. Bibliography

wiki

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