Rock & Mineral Encyclopedia

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

Graveyard Point Agate

A celebrated plume agate from the Oregon-Idaho border, known for dramatic black, gold, and red plumes in clear chalcedony.

A collectible Oregon plume and scenic agate with feathery red and gold inclusions suspended in translucent chalcedony.

A chalcedony agate marked by round, concentric ring patterns that resemble eyes when cut and polished.

Glacially transported banded agates found along Lake Huron's shores, typically small, frosted pebbles with red-orange iron banding.

A banded, metamorphosed iron formation in which bright red jasper alternates with silvery hematite or magnetite layers.

A translucent chalcedony from Montana filled with black and red dendritic inclusions that look like moss, ferns, or scenic landscapes.

A red-toned banded chalcedony colored by iron oxides, ranging from natural carnelian-like reds to heat-treated stones.