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bn:00057284n
Noun Concept
Categories: Volcanic rocks, Igneous petrology, Ultramafic rocks
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nephelinite  Nephelinites  olivine nephelinite
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Nephelinite is a fine-grained or aphanitic igneous rock made up almost entirely of nepheline and clinopyroxene. Wikipedia
Igneous rock most common in lavas of recent and Tertiary age, which have a fair amount of sodium Wikidata
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