mineral

Banded Agate

Cryptocrystalline Quartz (SiO2)

Hardness: 6.5-7 on Mohs scale; Color: Multi-colored bands (gray, yellow, brown); Luster: Waxy to vitreous; Structure: Trigonal/Microcrystalline; Cleavage: None; Fracture: Conchoidal.

Hardness: 6
Color: Multi-colored bands (gray, yellow, brown)
Luster: Waxy to vitreous

Identified May 7, 2026More mineral →

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Physical properties

Hardness: 6.5-7 on Mohs scale; Color: Multi-colored bands (gray, yellow, brown); Luster: Waxy to vitreous; Structure: Trigonal/Microcrystalline; Cleavage: None; Fracture: Conchoidal.

Formation & geological history

Formed in cavities (vesicles) of volcanic rocks or ancient lavas through the deposition of silica-rich groundwater. As silica layers settle over time, they create the distinctive banding pattern. Millions of years old.

Uses & applications

Commonly used in jewelry (cabochons, beads), decorative ornaments, mortar and pestles for laboratories due to hardness, and as a popular collector's item.

Geological facts

Agates are named after the Achates River in Sicily. They are essentially layers of chalcedony. Each agate is unique in its banding pattern, acting like a geological fingerprint.

Field identification & locations

Identify by its translucent nature when held to light and its characteristic concentric or parallel bands. Commonly found in riverbeds, basaltic coastal areas, and gravel pits globally.