Natural Blue Kyanite Polished Tip Tumbled Crystal

Among the books, decks, and stones on 14th Street is this tumbled stone: Natural Blue Kyanite Polished Tip Tumbled Crystal (shop SKU HBKPT).

Kyanite is an aluminum silicate that typically forms bladed crystals, often in blue. It has two hardnesses depending on direction and should be set and worn with care.

The title describes a mix of natural or raw surfaces and polished areas. Tumbled stones are polished in a drum, which softens sharp edges and brings out color. Natural stones vary in color, clarity, and shape, so the piece you receive will have its own character even when the weight, grade, or size is listed.

• SKU: HBKPT

See it at Namaste Bookshop, 2 West 14th Street near Union Square in New York City, or order online.