Rock & Mineral Encyclopedia

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

Purple Agate

A purple-toned banded chalcedony, sometimes naturally amethystine but frequently produced by dyeing gray agate.

Clusters of tiny botryoidal chalcedony spheres resembling bunches of grapes, famously purple, found in Indonesia.

An affordable multicolored banded and mossy chalcedony from India, common in tumbled stones, beads, and meditation pieces.