Kaersutite is a dark brown to black double-chain calcic titanium-bearing amphibole mineral with formula: NaCa2(Mg3Ti4+Al)(Si6Al2)O22(O)2.
[6] Ferro-kaersutite is the divalent iron-rich endmember of the kaersutite group, with the iron replacing magnesium in the structure.
[7] Kaersutite occurs as phenocrysts in alkalic volcanic rocks, in nodules of peridotite and gabbro in alkalic basalts, and in syenites, monzonites, and carbonatite tuffs.
[2] It was first described in 1884 and is named for Qaersut (formerly Kaersut), Umanq district in northern Greenland.
This article about a specific silicate mineral is a stub.