Kyanite is an aluminum silicate and it belongs to the triclinic crystal system.  kyanite has two different hardnesses. Long wise on the crystal has a hardness of 4-5 across the crystal is 6-7. Kyanite is usually found in a light blue color but can also be found in other colors such as white, colorless, gray, green, and nearly black.

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Free Form Kyanite Silver Pendant

This Pendant is 24mm tall & 15mm wide (.93"x .60")