mineral

Blue-gray rough mineral specimen, possibly kyanite

Undetermined; kyanite is a possible identification (Al₂SiO₅)

AI-generated identification · may be incorrect

Opaque to translucent blue-gray material with a dull to vitreous luster and uneven, layered-looking surfaces. The photo does not show diagnostic crystal form or cleavage clearly enough to establish hardness or identify it confidently.

Identified October 6, 2026More mineral →

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Physical properties

Formation & geological history

If kyanite, it formed during high-pressure regional metamorphism of aluminum-rich rocks; such deposits are commonly Paleozoic or older. The specimen’s origin and age cannot be determined from the image alone.

Uses & applications

Kyanite is used in refractory ceramics and, when gem-quality, in jewelry; this rough piece appears more suited to collecting or display.

Geological facts

Kyanite has strongly direction-dependent hardness—about 4.5–5 parallel to its length and 6.5–7 across it—making it distinctive but difficult to cut.

Field identification & locations

The blue-gray color is compatible with kyanite, but visual evidence is insufficient to rule out other minerals or a rock aggregate. Check crystal habit, cleavage, and hardness, or obtain a mineral test; kyanite occurs notably in India, Nepal, Brazil, and the United States.