metamorphic

Blue Kyanite in Schist

Al2SiO5 in Mica Schist

AI-generated identification · may be incorrect

Hardness: 4.5-7 (variable based on axis), Color: Blue, grey, white, Luster: Vitreous to pearly, Crystal structure: Triclinic, Cleavage: Perfect in one direction

Hardness: 4

Identified July 20, 2026More metamorphic →

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Physical properties

Hardness: 4.5-7 (variable based on axis), Color: Blue, grey, white, Luster: Vitreous to pearly, Crystal structure: Triclinic, Cleavage: Perfect in one direction

Formation & geological history

Formed during high-pressure regional metamorphism of clay-rich sedimentary rocks (pelites). Common in mountain belts where tectonic plates collide.

Uses & applications

Industrial use in heat-resistant ceramics (mullite), spark plugs, and as a gemstone or collector's specimen for metaphysical belief systems.

Geological facts

Kyanite is unique because its hardness differs significantly depending on the direction of the crystal: it is a 4.5 along the length and a 7 across the width.

Field identification & locations

Identified by its bladed crystal habit and distinct blue color often associated with silvery mica flakes. Found in metamorphic regions like North Carolina, Brazil, and Nepal.