mineral

Green Kyanite

Kyanite (Al2SiO5)

AI-generated identification · may be incorrect

Hardness: 4.5 to 7 on Mohs scale (anisotropic); Color: Light to dark green; Luster: Vitreous to pearly; Crystal System: Triclinic; Cleavage: Perfect; Specific Gravity: 3.53 - 3.67.

Hardness: 4
Color: Light to dark green
Luster: Vitreous to pearly

Identified June 18, 2026More mineral →

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Physical properties

Hardness: 4.5 to 7 on Mohs scale (anisotropic); Color: Light to dark green; Luster: Vitreous to pearly; Crystal System: Triclinic; Cleavage: Perfect; Specific Gravity: 3.53 - 3.67.

Formation & geological history

Formed during high-pressure regional metamorphism of clay-rich sedimentary rocks. It is a polymorph with andalusite and sillimanite, typically appearing in schists and gneisses.

Uses & applications

Used in the manufacture of high-heat refractories (bricks, mortars, kiln furniture), spark plugs, and as a gemstone for jewelry or metaphysical collecting.

Geological facts

Kyanite is unusual because it has two different hardness ratings depending on the direction of the scratch. Green kyanite gets its color from trace amounts of iron or chromium.

Field identification & locations

Look for bladed crystal habits and varying hardness. Commonly found in Brazil, India, and parts of the United States like North Carolina and Virginia.