mineral

Banded Agate

Cryptocrystalline variety of Quartz (SiO2)

Hardness: 6.5-7 on Mohs scale; Color: Multicolored bands of brown, white, and green; Luster: Waxy to vitreous; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.64

Hardness: 6
Color: Multicolored bands of brown, white, and green
Luster: Waxy to vitreous

Identified May 22, 2026More mineral →

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Physical properties

Formation & geological history

Formed primarily in volcanic and metamorphic rocks through the deposition of silica from groundwater in rock cavities (geodes) or veins. The banding represents different stages of mineral deposition.

Uses & applications

Extremely popular for use in jewelry (pendants, beads), ornamental carvings, burnishing tools in leatherworking, and as a collector's specimen.

Geological facts

Agate is named after the Achates River in Sicily where it was first discovered. Legend says that it can protect the wearer from danger and give them strength.

Field identification & locations

Identify by its characteristic colorful banding and translucent appearance when held to light. Can be found globally, notably in Brazil, Uruguay, and across the United States.

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