Rock & Mineral Encyclopedia

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

Carver Agate

A collectible Oregon plume and scenic agate with feathery red and gold inclusions suspended in translucent chalcedony.

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

A green ornamental stone, often serpentine-rich marble or verde antique, valued for its rich green color and white veining.

A pale green variety of feldspar moonstone showing a soft white or bluish adularescent sheen over a greenish body.

Rutile is a major titanium ore and the famous golden needle inclusion that gives rutilated quartz its shimmering threads.

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

A green-and-red ornamental stone of epidote and red piemontite or iron oxide, named for its dragon-skin coloring; not a true jasper.

A banded agate whose internal structures resemble cathedral spires, arches, or a city skyline of towers and pinnacles.

A fine-grained, sodium-rich contact-metasomatic rock formed where shale is albitized next to intruding diabase or spilite.

A translucent chalcedony agate containing delicate, feather- or plume-shaped mineral inclusions that branch like soft feathers.

A schist derived from clay-rich sediments, rich in mica and often bearing index minerals like garnet, staurolite, or kyanite.

An opaque blue variety of chalcedony jasper, less common than red or green forms, colored by mineral inclusions.

A transparent to milky opal that displays a soft bluish-white internal glow or sheen that seems to follow the light source.

A warm earth-toned jasper from Madagascar in flowing reds, oranges and golds, also called desert jasper, discovered in the early 2000s.

A vivid blue-green hydrated copper silicate, soft on its own but prized as a gem when hardened by intergrown quartz or chalcedony.