Rock & Mineral Encyclopedia

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

Pigeon Blood Agate

A richly colored red banded agate prized by lapidaries for its deep crimson-to-brown tones reminiscent of pigeon's blood.

An altered granite mottled pink and green from feldspar and epidote, popular as a tough, colorful ornamental rock.

A cream-colored feldspar-and-quartz rock peppered with dark spots, named for its resemblance to a Dalmatian dog.

A banded, metamorphosed iron formation in which bright red jasper alternates with silvery hematite or magnetite layers.