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Ferri-kaersutite

Kaersutite is a dark brown to black double chain calcic titanium bearing amphibole mineral with formula: NaCa2(Mg3TiAl)(Si6Al2)O22(OH)2. Ferro-kaersutite is the divalent iron rich endmember of the kaersutite group, with the iron replacing magnesium in the structure. 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.

General Info About Ferri-kaersutite

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Physical Properties of Ferri-kaersutite

Colors

Brown

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Chemical Properties of Ferri-kaersutite

Formula

NaCa₂(Mg₃Fe³⁺Ti)(Al₂Si₆O₂₂)O₂

The Kaersutite group minerals are ^WO^2- dominant amphiboles defined with :

^A(Na+K+2Ca)> 0.5 apfu,

^B: Ca dominant

^CTi > 0.5 apfu and

^WO > 1.0 apfu

Ferri-kaersutite is defined with

A position: Na dominant

C²⁺ position: Mg dominant

C³⁺ position: Fe dominant

Elements listed

Al, Ca, Fe, Mg, Na, O, Si, Ti

Characteristics of Ferri-kaersutite

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