mineral

Banded Agate

Chalcedony (SiO2) with impurities

Hardness: 6.5-7 on Mohs scale. Color: Translucent white, cream, and orange/honey-colored bands. Luster: Waxy to vitreous. Crystal Structure: Trigonal (microcrystalline/cryptocrystalline). Cleavage: None, exhibits conchoidal fracture.

Hardness: 6
Color: Translucent white, cream, and orange/honey-colored bands
Luster: Waxy to vitreous

Identified June 30, 2026More mineral →

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Physical properties

Formation & geological history

Forms through the deposition of silica from groundwater into cavities (vugs) within igneous or sedimentary rocks. The banding represents rhythmic crystallization over time. Formation can occur from millions to hundreds of millions of years ago.

Uses & applications

Primarily used in jewelry (cabochons), ornamental carvings, and gemstone therapy. Historically used for making tools and seals due to its toughness.

Geological facts

Agate is named after the Achates River in Sicily, now known as the Dirillo River. It was highly prized by the ancient Greeks and Romans for protective amulets.

Field identification & locations

Identify in the field by its distinct colorful banding, waxy appearance when wet, and its ability to scratch glass. Commonly found in riverbeds, glacial till, and volcanic regions.