Close-up of a polished agate or marble-like stone slice with layered banding in white, gray, beige, and soft blue-gray tones, with darker brown edges.

CASAS GRANDES AGATES

Casas Grandes Agate comes from the desert country of northern Chihuahua, near the Casas Grandes region. It is known for its wide variety of colors and patterns, with some pieces showing bold bands of purple, red, cream, yellow, and translucent gray. (Mineral Auctions)

When polished, the stone can reveal deep, flowing bands and striking patterns that make every piece different. Like many Chihuahua agates, its beauty comes from the natural volcanic landscape where these colorful layers formed.