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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.[1]

It was first described in 1884 and is named for Qaersut (formerly Kaersut), Umanq district in northern Greenland.[2]


1. ^ a b http://rruff.geo.arizona.edu/doclib/hom/kaersutite.pdf Handbook of Mineralogy
2. ^ a b http://www.mindat.org/min-2129.html Mindat: Kaersutite
3. ^ http://www.webmineral.com/data/Kaersutite.shtml Webmineral data

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