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leucitite

extrusive igneous rock, coloured ash gray to nearly black, that contains leucite and augite as large, single crystals (phenocrysts) in a fine-grained matrix (groundmass) of leucite, augite, sanidine, apatite, titanite, magnetite, and melilite; in this regard it is similar to nephelinite (q.v.), which contains nepheline in place of leucite.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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