mineral

Banded Agate

Microcrystalline Quartz (SiO2) with impurities

Hardness: 6.5-7 on Mohs scale. Color: Brown, tan, and white banding. Luster: Waxy to vitreous. Crystal structure: Trigonal/Microcrystalline. Specific gravity: 2.58-2.64.

Hardness: 6
Color: Brown, tan, and white banding
Luster: Waxy to vitreous

Identified May 3, 2026More mineral →

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Physical properties

Hardness: 6.5-7 on Mohs scale. Color: Brown, tan, and white banding. Luster: Waxy to vitreous. Crystal structure: Trigonal/Microcrystalline. Specific gravity: 2.58-2.64.

Formation & geological history

Formed primarily in volcanic rock cavities (vugs) through the deposition of silica from groundwater. The characteristic banding is created by rhythmic crystallization over thousands of years.

Uses & applications

Commonly used in jewelry, lapidary arts (cabochons), precision pendulums, and as ornamental river stones. Known for its durability and ability to take a high polish.

Geological facts

Agate is named after the Achates River in Sicily. It is often found as geodes or water-worn pebbles. The distinctive banding is actually ultra-fine layers of chalcedony.

Field identification & locations

Identify in the field by its waxy luster, translucency when held to light, and distinct concentric or parallel layers. Commonly found in riverbeds, beaches, and volcanic regions worldwide.

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