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.

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