metamorphic
Blue Kyanite in Schist
Al2SiO5 in Mica Schist
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
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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.
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