Rock & Mineral Encyclopedia

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

Blue Kyanite

A striking blue aluminum silicate famous for bladed crystals and anisotropic hardness that differs dramatically along and across the blade.

The purple variety of quartz, colored by iron and natural irradiation, prized as the classic violet birthstone of February.

A pastel purple variety of common opal, valued for its gentle lilac body color rather than any play-of-color.

A historic name for the red-violet to purplish lithium tourmaline first prized from Siberia, closely tied to the rubellite variety.

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

The pure golden-yellow gem variety of beryl, colored by iron and valued for its clarity, brilliance, and durability.

The vivid, pure yellow tourmaline marketed as canary, a rare manganese-rich variety from Zambia and Malawi.

The intensely glowing orange variety of spessartine garnet, prized for its pure 'Fanta-orange' fire and high brilliance.