sedimentary

Banded Agate

Silicon Dioxide (SiO2)

Hardness: 6.5-7 on the Mohs scale. Color: Layers of orange, white, and reddish-brown. Luster: Waxy to vitreous. Structure: Cryptocrystalline. Cleavage: None.

Hardness: 6
Color: Layers of orange, white, and reddish-brown
Luster: Waxy to vitreous

Identified July 21, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 on the Mohs scale. Color: Layers of orange, white, and reddish-brown. Luster: Waxy to vitreous. Structure: Cryptocrystalline. Cleavage: None.

Formation & geological history

Formed through the deposition of silica from groundwater in the cavities of igneous rocks or sedimentary layers. The banding occurs due to changes in the impurity content during the deposition process.

Uses & applications

Primarily used in jewelry, lapidary arts, and as decorative collectibles. Historically used for making mortars and pestles due to its hardness.

Geological facts

Agate is named after the Achates River in Sicily where it was first discovered. It has been used in amulets and hardstone carving since the time of Ancient Greece.

Field identification & locations

Identified by its distinctive color banding and waxy appearance. Commonly found in riverbeds or volcanic regions. Collectors look for clarity and sharp definition between the colored bands.