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 natural sheen obsidian showing a warm gold shimmer plus peacock iridescence, caused by aligned nanoparticle layers within black glass.

Yellow to golden volcanic glass; natural examples owe their color to iron, though much bright yellow obsidian on the market is manufactured glass.

A yellow to golden banded chalcedony colored by iron, ranging from natural honey tones to dyed commercial stones.

A natural bicolor quartz that combines purple amethyst and golden citrine in a single crystal.