Rock & Mineral Encyclopedia

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

Exotica Jasper

Also called Sci-Fi Jasper, a Mexican jasper-rhyolite with swirling abstract patterns in cream, tan, gray, pink, and green.

A soft pink to crimson hydrated cobalt arsenate, famous as cobalt bloom that signals nearby cobalt ores.

A massive green-to-pink hydrogrossular garnet from South Africa used as a jade simulant, not a true jade.

Plume and fortification agate from the famous Woodward Ranch near Alpine, Texas, known for red and pink plumes.

A striking rock of green zoisite studded with red-pink ruby crystals and black hornblende, also called anyolite.

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

A prized plume agate with rose-pink and red feathery inclusions suspended in clear chalcedony, from the western U.S.

A creamy pink-and-white chalcedony from Madagascar containing flower-like plume inclusions that resemble blossoms suspended in stone.

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

A deep wine-red to maroon tourmaline colored by manganese, a rich darker-toned member of the red-pink rubellite family.

A prized plume agate from near Carey, Idaho, showing red, pink and black feathery plumes floating in translucent chalcedony.

Molybdenite is the primary ore of molybdenum, a soft, greasy, silver-gray sulfide that closely resembles graphite.

A hydrated volcanic glass with pearly, onion-like concentric cracks that pops into lightweight white granules when heated.