Rock & Mineral Encyclopedia

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

Leopard Opal

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

A common opal colored green by nickel or chromium impurities, usually opaque and cut into cabochons and beads.

A translucent common opal from the Andes prized for its serene blue to blue-green color, usually cut into cabochons and beads.