charnockite

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charnockite

any member of a series of metamorphic rocks with variable chemical composition, first described from the state of Tamil Nadu in southern India and named for Job Charnock. The term is often limited to the characteristic orthopyroxene granite of the series. Charnockite occurs all over the world, most often in deeply eroded Precambrian basement rock complexes

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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