mineral

Banded Agate (specifically Carnelian Agate)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Hardness: 6.5-7 (Mohs scale), Color: Reddish-orange with creamy white/brown bands, Luster: Vitreous to waxy, Crystal Structure: Hexagonal (trigonal), Cleavage: None (conchoidal fracture), SG: 2.58-2.64

Hardness: 6

Identified April 9, 2026More mineral →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Formed by the deposition of silica from groundwater in cavities of igneous rocks or sedimentary formations over millions of years. The bands are created by periodic changes in the silica concentration and mineral impurities.

Uses & applications

Widely used for jewelry (beads, cabochons), ornamental objects, carvings, and as a popular specimen for crystal collecting and healing practices.

Geological facts

Agate has been used since the Babylonian times for ornaments and tools. The name 'Carnelian' specifically refers to the brownish-red variety of chalcedony colored by iron oxide.

Field identification & locations

Identify in the field by its waxy luster, hardness (will scratch glass), and distinctive concentric or parallel banding when broken or tumbled. Commonly found in Brazil, India, and the Lake Superior region.

Other mineral specimens

See all

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

metamorphic

Nephrite Jade

Nephrite

Mineral/Rock

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Metamorphic Rock

Green Apatite on Albite

Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]

mineral

Epidote

Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)

mineral