metamorphic

Blue kyanite in quartz-rich matrix

Kyanite, Al₂SiO₅, in a quartz- and mica-bearing metamorphic rock

AI-generated identification · may be incorrect

Pale blue-gray, bladed kyanite crystals in a rough, light-colored matrix; kyanite has vitreous to pearly luster, triclinic crystals, perfect cleavage, and hardness 4.5–5 parallel to the blades and 6.5–7 across them. The matrix appears quartz-rich, but its exact composition cannot be confirmed visually.

Identified September 28, 2026More metamorphic →

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Physical properties

Formation & geological history

Kyanite forms during medium- to high-pressure regional metamorphism of aluminum-rich sediments, commonly in schist or gneiss; the rock’s age depends on its source locality.

Uses & applications

Kyanite is used in refractory ceramics and as a collectible mineral; attractive crystals may be cut for jewelry, though cleavage makes this difficult.

Geological facts

Kyanite’s hardness varies markedly with direction, a distinctive property among common minerals.

Field identification & locations

Look for blue, elongated blades with strong directional hardness in a pale metamorphic matrix; common sources include Brazil, India, Nepal, and the United States. Rough specimens of this apparent size and quality typically sell for about $10–$50 USD.