Rock & Mineral Encyclopedia

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

Gold

A dense, soft, intensely yellow native metal valued for millennia in coinage, jewelry, and electronics.

A dense, durable, silvery-white precious metal that resists corrosion, used in fine jewelry and catalytic converters.

An unusually pure, transparent-to-translucent obsidian with few inclusions; truly water-clear specimens are rare in nature.