Rock & Mineral Encyclopedia

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

Green Agate

A green-hued banded chalcedony, ranging from natural soft greens to brightly dyed commercial stones.

A yellow to golden banded chalcedony colored by iron, ranging from natural honey tones to dyed commercial stones.

A soft peachy-orange variety of banded chalcedony, naturally iron-tinted or dyed, popular for warm-toned beads and jewelry.

Abundant banded chalcedony from southern Brazil, the world's main source of agate slices and dyed agate products.

A purple-toned banded chalcedony, sometimes naturally amethystine but frequently produced by dyeing gray agate.

A soft pink banded chalcedony, occurring naturally in delicate hues and also commonly produced by dyeing.

A banded chalcedony agate with bold alternating dark and light stripes resembling zebra markings, sometimes color-enhanced.

A red-toned banded chalcedony colored by iron oxides, ranging from natural carnelian-like reds to heat-treated stones.

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

A white to grayish banded chalcedony, the natural base color of much agate and the substrate for many dyed stones.

A treated chalcedony with a network of crackled veins, usually heated and dyed in vivid colors for affordable, eye-catching beads.

A solid jet-black chalcedony, usually a dyed and treated agate, prized for sleek polished beads, cabochons, and intaglios.

Agate that forms in flat cracks or veins of host rock rather than rounded nodules, producing straight, parallel banding.