Blue Calcite Tumbled Crystals

Blue Calcite Tumbled Crystals (shop SKU LBCT) is offered as a tumbled stone online and at the bookshop on West 14th Street.

Calcite is calcium carbonate, a soft mineral that can form in many colors and crystal habits, including columnar 'vortex' shapes. Because it is soft, it is best kept dry and handled gently.

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: LBCT

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