Overview

melilitite


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A dark-coloured, extrusive, ultrabasic, alkaline igneous rock containing essential melilite, olivine, and nepheline. The active alkaline volcano Nyiragongo in Zaire is famous for its melilitite lavas which are found associated with other ultra-alkaline lavas, e.g. leucitites and nephelinites.

Subjects: Earth Sciences and Geography.


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