Rock Identifier

Rock & Mineral Encyclopedia

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

all crystal gemstone mineral igneous sedimentary metamorphic

Pink Lady Obsidian

Obsidian showing a pink-to-rose sheen or hue; natural examples get color from interference effects, while uniform pink material is often manufactured glass.

Royal Blue Obsidian

A deep royal-blue glass sold as obsidian; the rich blue body color is manufactured, unlike natural blue-sheen obsidian whose blue is only a surface effect.

Calico Obsidian

A mottled, multicolored obsidian blending black, brown, grey, and tan patches like a calico cat's patchwork coat.

Super Seven

A trade name for quartz containing a combination of seven minerals including amethyst, smoky quartz, and cacoxenite, prized by collectors.

Rainbow Moonstone

A near-colorless feldspar showing blue and multicolored sheen; gemologically a white labradorite rather than true orthoclase moonstone.

Goshenite

The colorless variety of beryl, named after Goshen, Massachusetts, prized for its purity, clarity, and durability.

Goshenite Crystal

Goshenite Crystal

The pure colorless variety of beryl, valued as crystal specimens and as a brilliant alternative to clearer gemstones.

Clear Tourmaline

Clear Tourmaline

A transparent, water-clear elbaite tourmaline (achroite), the rare colorless and highly transparent form of the tourmaline group.

White Tourmaline

White Tourmaline

A colorless to milky-white elbaite tourmaline known as achroite, the rare nearly pigment-free member of the tourmaline group.

White Topaz

A colorless, transparent variety of topaz valued as an affordable, hard, brilliant alternative to diamond in jewelry.

White Beryl

The colorless to milky-white variety of beryl, known mineralogically as goshenite and once used to imitate diamond and other gems.

Rosterite

An old varietal name for alkali- and cesium-rich beryl, typically colorless to pale pink, overlapping with vorobyevite and morganite.

Clear Beryl

Transparent, colorless beryl (goshenite), the pure form of the species valued for its clarity, hardness, and well-formed crystals.

Clear Obsidian

An unusually pure, transparent-to-translucent obsidian with few inclusions; truly water-clear specimens are rare in nature.

Watermelon Obsidian

A pink-and-green bicolor glass sold as obsidian; the watermelon coloring is manufactured and does not occur in natural volcanic glass.

Amazonite

The blue-green gem variety of microcline feldspar, often mottled with white, prized as an affordable ornamental stone.

Indian Agate

An affordable multicolored banded and mossy chalcedony from India, common in tumbled stones, beads, and meditation pieces.

Spinel

A durable magnesium aluminum oxide gem that occurs in many colors and was long mistaken for ruby.

Banded Agate

The classic agate defined by concentric or parallel bands of chalcedony in varied colors, the archetype of all agate varieties.

Agate

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

Red Tourmaline

Vivid red to raspberry tourmaline, the most intense colors are marketed as rubellite, colored by manganese in the elbaite structure.

Lotus Garnet

A delicate pinkish-purple to peach garnet from Tanzania, a pyrope-spessartine blend named for the soft colors of a lotus flower.

Dragon Vein Agate

A treated chalcedony with a network of crackled veins, usually heated and dyed in vivid colors for affordable, eye-catching beads.

Iris Agate

A banded agate that diffracts transmitted light into rainbow colors when cut thin and backlit, producing a spectacular iridescence.