Rock & Mineral Encyclopedia

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

Opalite

A man-made opalescent glass that glows milky blue in reflected light and warm orange when backlit, often sold as a crystal.

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

A spotted jasper-rhyolite patterned with leopard-like rings and ovals, valued as an earthy ornamental and lapidary stone.

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

Black volcanic glass dotted with radiating spherulite bursts that look like exploding fireworks frozen in the stone.

A red-toned banded chalcedony colored by iron oxides, ranging from natural carnelian-like reds to heat-treated stones.

A chalcedony agate with red, orange, and yellow plume or banding patterns that rise like dancing flames within the stone.

A vivid Australian jasper-like silica stone in earthy reds, yellows, and purples, formed from silicified radiolarian sediment.

A fiery jasper whose red, orange, and yellow plumes lick across the stone like flames against an earthy background.