Rock & Mineral Encyclopedia

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

Moss Agate

A translucent chalcedony filled with green or brown dendritic mineral inclusions that resemble moss, foliage, or landscapes.

A dark green-and-black stromatolite jasper patterned with swirling orbs, formed from fossilized ancient microbial colonies.

The classic green gem variety of elbaite tourmaline, ranging from bright grass-green to deep forest tones colored by iron or chromium.

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

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

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

A warm orange-to-red variety of chalcedony quartz colored by iron oxide, used since antiquity for seals, beads, and cabochons.

A rare greenish-black vanadium sulfide that was historically one of the world's most important ores of vanadium.

A deep blue copper carbonate mineral that forms in oxidized copper deposits, often alongside green malachite.

A trade term for yellow garnets, including golden grossular, yellow andradite (topazolite), and yellow-green Mali garnet.

A dense, high-pressure metamorphic rock famous for its red garnets set in bright green pyroxene, formed deep within subduction zones.

A prized Idaho jasper known for porcelain-smooth pastel pinks, creams, and greens in soft swirling, orbicular patterns.

Tourmaline crystals displaying two or more distinct colors at once, including the famous pink-and-green watermelon variety.

A group of silicate gemstones best known for deep red but spanning nearly every color, including green tsavorite and orange spessartine.