mineral

Banded Agate (specifically shades of Carnelian Agate)

Silicon Dioxide (SiO2)

Hardness: 6.5-7 (Mohs scale), Color: Oranges, whites, and tans in distinct layers, Luster: Waxy to vitreous, Crystal Structure: Cryptocrystalline (Trigonal), Cleavage: None (Conchoidal fracture), Specific Gravity: 2.58-2.64

Hardness: 6

Identified April 20, 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 as a secondary mineral in volcanic cavities or gas bubbles (vesicles) when silica-rich groundwater deposits layers of microscopic quartz over thousands of years. Often associated with rhythmic precipitation of silica.

Uses & applications

Commonly used in jewelry (cabochons, beads), decorative carvings, paperweights, and as a collector's stone. Industrially used for precision pendulums and laboratory mortars/pestles due to its hardness.

Geological facts

The name Agate comes from the Achates River in Sicily. The orange-red color specifically seen here is caused by impurities of iron oxide (hematite). Agates were once used as charms to protect from thirst and fever.

Field identification & locations

Identify in the field by its distinctive parallel banding, waxy texture when wet, and the way light passes through its edges (translucency). Commonly found in river beds, beaches, and areas with ancient volcanic activity.

Other mineral specimens

See all

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Schist

Metamorphic

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