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leucitite

A Dictionary of Earth Sciences | 1999 | | © A Dictionary of Earth Sciences 1999, originally published by Oxford University Press 1999. (Hide copyright information) Copyright

leucitite An extrusive, undersaturated (see SILICA SATURATION), mafic igneous rock consisting of essential leucite and augite, with accessory iron oxide and apatite. When olivine or nepheline are also present, the rock is termed an olivineleucitite or a nepheline-leucitite respectively. Leucitites are allied to phonolites, with which they are commonly associated in the field.

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