mineral

Banded Agate

Silicon Dioxide (SiO2)

Hardness: 6.5-7 (Mohs scale); Color: White, cream, and tan bands; Luster: Waxy to vitreous; Crystal Structure: Trigonal (cryptocrystalline); Cleavage: None; Specific Gravity: 2.58-2.64

Hardness: 6
Color: White, cream, and tan bands
Luster: Waxy to vitreous

Identified June 6, 2026More mineral →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: White, cream, and tan bands; Luster: Waxy to vitreous; Crystal Structure: Trigonal (cryptocrystalline); Cleavage: None; Specific Gravity: 2.58-2.64

Formation & geological history

Formed in cavities of volcanic rocks or ancient lavas. Secondary fluids rich in silica deposit layers along the walls of the cavity over long periods of time. Most are from the Cenozoic era.

Uses & applications

Used primarily in lapidary arts, jewelry (cabochons), interior decoration, and as a collector's specimen. Historically used for burnishing tools.

Geological facts

Agate is named after the Achates River in Sicily where it was first discovered. The banding is caused by periodic changes in the composition of the silica-bearing fluids.

Field identification & locations

Identified by its waxy luster, conchoidal fracture, and characteristic banding. Often found in riverbeds or areas with volcanic history. Collectors should look for translucency when held to light.