Rock & Mineral Encyclopedia

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

Ocean Jasper

A multicolored orbicular chalcedony from Madagascar famous for its circular eye-like orbs in greens, pinks, whites, and yellows.

Plume and fortification agate from the famous Woodward Ranch near Alpine, Texas, known for red and pink plumes.

A coarse, feldspar-rich sandstone, often pink, that records rapid erosion of granitic source rock under arid conditions.

A warmly colored chalcedony agate with reds, oranges, golds, and pinks that blend like the glowing bands of a sunset sky.

A deep red banded agate colored by iron oxides, valued as a vivid red lapidary and jewelry stone.

A chalcedony agate with red, orange, and yellow plume or banding patterns that rise like dancing flames within the stone.

A water-bearing massive grossular garnet, usually green or pink, widely used as a tough jade-like carving stone.

A single beryl crystal showing two distinct color zones, such as aquamarine blue grading into morganite pink, within one stone.

A creamy pink-and-white chalcedony from Madagascar containing flower-like plume inclusions that resemble blossoms suspended in stone.

A soft pink common opal from the Peruvian Andes, prized for its opaque rosy color rather than play-of-color.

Limestone built from tiny rounded ooid grains resembling fish roe, formed in warm, agitated shallow seas.

A limestone made of tiny spherical ooids, resembling fish roe, formed in warm, agitated shallow seas.

A common potassium feldspar identical in composition to orthoclase but more ordered, famous for its green gem variety amazonite.

Ancient chemically deposited rock of alternating iron-oxide and silica bands recording Earth's early oxygenation and a major iron ore source.

A jasper whose radiating mineral clusters form flower-like rosettes scattered across an earthy background.