Green Calcite Tumbled

This tumbled stone is listed as Green Calcite Tumbled (shop SKU LGCT5), and is sold at Namaste Bookshop near Union Square.

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: LGCT5

Look for it at Namaste Bookshop, 2 West 14th Street near Union Square, or order from the shop online.