Kalsilite

tectosilicate

nepheline

Formula:KAlSiO4
Tectosilicate (framework silicate), feldspathoid
Specific gravity: 2.6
Hardness: 6
Streak: White
Colour: colourless, grey, grey white, white
Environments:

Plutonic igneous environments
Volcanic igneous environments

Kalsilite is found as embedded grains in silica-undersaturated lavas and nepheline-bearing igneous rocks, associated or intergrown with nepheline.

Common impurities: Fe,Mg,Ca,Na

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