Rock & Mineral Encyclopedia

Search and identify 1,000+ rocks, minerals, crystals, and gemstones — with properties, formation, colors, hardness, and how to tell them apart.

Orca Agate

A bold black-and-white banded chalcedony named for its orca-like coloring, popular as carvings and statement jewelry.

A deep black variety of banded chalcedony, often closely related to or treated like onyx, used for jewelry and carvings.

An opaque, often colorfully patterned variety of chalcedony quartz, popular for tumbling, carving, and jewelry.

An altered granite of pink feldspar, green epidote and quartz, mottled pink-and-green and popular as a tumbled and carving stone.