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 rare agate that forms naturally with flat polygonal faces and angular geometric shapes rather than the usual rounded nodule.

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

A warmly colored chalcedony agate with reds, oranges, golds, and pinks that blend like the glowing bands of a sunset sky.

A chalcedony agate with soft, billowing cloud-like masses of gray and white suspended in a translucent body.

A fortification agate from the Black Hills of South Dakota, known for tight, colorful banding closely related to the famous Fairburn agate.

A fiery jasper whose red, orange, and yellow plumes lick across the stone like flames against an earthy background.

A rare Australian jasper from the Pilbara with bold red, yellow, and black abstract patterns, prized by collectors.