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urtite


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A coarse-grained, igneous rock consisting of essential nepheline (about 85% of the rock) and ferromagnesian minerals (aegirine, aegirine-augite, and soda-iron amphibole). The rock is named from Lujaur-Urt, in the Kola Peninsula, Russia, and is a type of undersaturated syenite.

Subjects: Earth Sciences and Geography.


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