mineral

Banded Agate

Silicon Dioxide (SiO2) - Chalcedony

Hardness: 6.5 - 7 on Mohs scale. Color: Cream, white, light beige with reddish-brown swirling bands. Luster: Waxy to vitreous. Crystal structure: Trigonal (microcrystalline quartz). Cleavage: None, exhibits conchoidal fracture. Specific gravity: 2.58 - 2.64.

Hardness: 6
Color: Cream, white, light beige with reddish-brown swirling bands
Luster: Waxy to vitreous

Identified July 26, 2026More mineral →

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Physical properties

Formation & geological history

Formed in cavities within volcanic rocks or ancient sedimentary deposits through silica-rich solutions slowly precipitating in layers over thousands to millions of years.

Uses & applications

Popular for lapidary art, jewelry, wire wrapping, worry stones, pocket stones, and general rock/mineral collecting.

Geological facts

Agate banding is created by subtle changes in trace mineral elements (like iron and manganese) as successive layers of chalcedony precipitate out of solution over geological time.

Field identification & locations

Identified by its distinctive microcrystalline texture, hardness, smooth tumbled surface, and fine concentric or wavy color bands. Common locations include Brazil, Madagascar, Mexico, and various regions across the United States.