Amethyst Cluster Geode Polished Free Form Cut base

This crystal tower is listed as Amethyst Cluster Geode Polished Free Form Cut base (listed at 2220 grams, shop SKU NAGPT11), and is sold at Namaste Bookshop near Union Square.

Aura, or aura-coated, quartz is natural quartz with a thin metal-vapor coating that creates an iridescent surface. The coating is decorative; any meaning people give it belongs to personal practice.

A cut base means the bottom has been sawn or ground flat so the piece can stand. A cluster is a group of crystals that grew together; no two have the same arrangement of points. 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.

• Weight: 2220 grams
• SKU: NAGPT11

Find it at Namaste Bookshop, 2 West 14th Street, a short walk from Union Square in Manhattan, or order it online.