mineral

Blue kyanite in matrix

Kyanite, Al₂SiO₅

AI-generated identification · may be incorrect

Bladed, blue-gray crystals with pearly to vitreous luster and prominent lengthwise striations; Mohs hardness is strongly directional, about 4.5–5 parallel to blades and 6.5–7 across them. The specimen appears to include pale quartz or mica matrix; exact composition cannot be confirmed visually.

Identified September 27, 2026More mineral →

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Physical properties

Formation & geological history

Kyanite forms during high-pressure metamorphism of aluminum-rich sediments, commonly in schist and gneiss. Its age depends on the host rock and may range from millions to billions of years.

Uses & applications

Used in high-temperature ceramics and refractory products; attractive crystals and specimens are collected, and clear material is occasionally cut as a gemstone.

Geological facts

Kyanite’s unusual direction-dependent hardness is a key diagnostic feature; its name comes from the Greek word for blue.

Field identification & locations

Look for bladed, striated blue crystals in metamorphic rocks, especially schist and gneiss; common sources include Nepal, Brazil, India, and the United States. The photo is consistent with kyanite, though laboratory or close examination would confirm it.