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Kaersutite is a dark brown to black amphibole mineral with formula: NaCa2(Mg4Ti)Si6Al2O23(OH)2.
It occurs as phenocrysts in alkalic volcanic rocks; in nodules of peridotite and gabbro in alkalic basalts; in syenites, monzonites and carbonatite tuffs. Mineral association includes titanian augite, rhoenite, olivine, ilmenite, spinel, plagioclase and titanian pargasite.
It was first described in 1884 and is named for Qaersut (formerly Kaersut), Umanq district in northern Greenland.
1. ^ a b http://rruff.geo.arizona.edu/doclib/hom/kaersutite.pdf Handbook of Mineralogy