mineral

Banded Agate

Cryptocrystalline Quartz (SiO2)

Hardness: 6.5-7 on Mohs scale; Color: Yellow, white, and translucent tan; Luster: Vitreous to waxy; Structure: Trigonal (microcrystalline); Cleavage: None; Fracture: Conchoidal.

Hardness: 6
Color: Yellow, white, and translucent tan
Luster: Vitreous to waxy

Identified May 9, 2026More mineral →

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Physical properties

Hardness: 6.5-7 on Mohs scale; Color: Yellow, white, and translucent tan; Luster: Vitreous to waxy; Structure: Trigonal (microcrystalline); Cleavage: None; Fracture: Conchoidal.

Formation & geological history

Formed in cavities within volcanic or sedimentary rocks through the deposition of silica from groundwater. The banding represents alternating layers of minerals and trace impurities over thousands of years.

Uses & applications

Commonly used for tumbled stones, beads, jewelry, cabochons, and decorative ornaments. Historically used for hardstone carving and as burnishing tools.

Geological facts

The world's largest known agate deposit is in the Rio Grande do Sul region of Brazil. Agate is named after the Achates River in Sicily where it was first discovered by ancient Greeks.

Field identification & locations

Identified by its waxy luster, light translucency, and the presence of parallel or concentric banding. Commonly found in riverbeds, along beaches, and in volcanic areas globaly.