Fluorite

Among the books, decks, and stones on 14th Street is this mineral specimen: Fluorite (shop SKU WJGFC189).

Fluorite is calcium fluoride and forms in cubes or octahedra, often in purple, green, or banded rainbow colors. It is relatively soft, so it is best handled gently. In crystal traditions, fluorite is associated with focus and clarity. Those ideas belong to folklore and personal practice, not to any medical claim.

Natural stones vary in color, clarity, and shape, so the piece you receive will have its own character even when the weight or grade is listed.

• SKU: WJGFC189

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