Rock & Mineral Encyclopedia

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

Crocoite

A striking lead chromate mineral prized for its brilliant orange-red prismatic crystals, with the finest specimens from Tasmania.

A royal-blue feldspathoid mineral with white calcite veining, often confused with lapis lazuli but lacking its golden pyrite flecks.

A dark, mineral-rich dike rock with abundant mica or amphibole phenocrysts set in a fine groundmass, often associated with gold and diamonds.

A dense, dark ultramafic plutonic rock composed almost entirely of pyroxene minerals, often associated with peridotite and layered intrusions.

Obsidian formed from two merged lava flows, producing a stone with two distinct bands of sheen or color.

A patterned common opal with mottled, leopard-like spots and blotches, prized as an ornamental and cabochon stone.

A natural bicolor quartz blending amethyst purple with prasiolite green in a single crystal, prized as a metaphysical heart-crown stone.

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

Bright yellow to golden tourmaline colored by manganese, with the most vivid canary stones among the rarest tourmaline hues.

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