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.

A man-made glittering glass packed with tiny copper crystals, traditionally reddish-brown but also made in blue and green.

A black obsidian displaying a golden metallic sheen caused by light reflecting off aligned microscopic gas bubbles or mineral inclusions.

Black volcanic glass with a warm bronze or coppery sheen produced by light reflecting off aligned microscopic inclusions.

The brassy iron sulfide mineral famous as 'fool's gold,' known for sharp metallic cubes and a much higher hardness than real gold.

A feldspar gemstone that sparkles with metallic glints (aventurescence) caused by tiny reflective copper or hematite platelets.

A black metallic silver antimony sulfide, historically a notable silver ore known as brittle silver ore.

A banded combination rock of golden tiger's eye, red jasper, and metallic hematite, formed in ancient iron deposits.