Rock & Mineral Encyclopedia

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

Cathedral Agate

A banded agate whose internal structures resemble cathedral spires, arches, or a city skyline of towers and pinnacles.

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

A banded agate that displays a moving shadow or flash across its surface when tilted under light, caused by closely spaced parallel bands.