Rock & Mineral Encyclopedia

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

Picture Jasper

An opaque brown chalcedony whose iron-stained banding mimics deserts, dunes, and distant mountain skylines.

Glacially deposited banded agates found along Lake Michigan beaches, small waterworn pebbles with concentric red and grey banding.

A vivid copper-bearing Mexican stone of red cuprite and green chrysocolla that evokes a desert sunset.

A banded variety of chalcedony quartz, classically black or black-and-white, long favored for cameos and beads.

A banded variety of chalcedony quartz, famed for its colorful concentric layers and enormous range of patterns and colors.

A fiery jasper whose red, orange, and yellow plumes lick across the stone like flames against an earthy background.

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.

The most common variety of quartz, milky white from microscopic fluid and gas inclusions, forming massive veins worldwide.

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

A white, porous borate mineral webbed with gray-black veins, widely dyed to imitate turquoise and other stones.