Rock & Mineral Encyclopedia

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

Carnelian

A warm orange-to-red variety of chalcedony quartz colored by iron oxide, used since antiquity for seals, beads, and cabochons.

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

A chalcedony agate filled with radiating needle-like mineral inclusions, prized for its starburst and spray patterns.

A jasper made of angular fragments naturally cemented back together, typically showing red and brown pieces in a quartz matrix.

A chalcedony agate with red, orange, and yellow plume or banding patterns that rise like dancing flames within the stone.

A pale jasper threaded with black, fern-like mineral dendrites that mimic plants, trees, and frost despite being inorganic.

A translucent agate whose mineral inclusions resemble miniature landscapes of trees, hills, and horizons within the stone.

An orbicular jasper with red and orange flower-like spots resembling poppies, famously from Morgan Hill, California.