mineral

Banded Agate

Silicon Dioxide (SiO2)

Hardness: 6.5-7 on Mohs scale; Color: Multi-colored bands (brown, white, gray); Luster: Waxy to vitreous; Crystal Structure: Trigonal (cryptocrystalline); Cleavage: None; Specific Gravity: 2.58-2.64

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

Identified May 22, 2026More mineral →

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Physical properties

Hardness: 6.5-7 on Mohs scale; Color: Multi-colored bands (brown, white, gray); Luster: Waxy to vitreous; Crystal Structure: Trigonal (cryptocrystalline); Cleavage: None; Specific Gravity: 2.58-2.64

Formation & geological history

Formed primarily in volcanic and metamorphic rocks. Created through the deposition of silica from groundwater in the cavities of igneous rocks, resulting in rhythmic concentric or parallel banding.

Uses & applications

Used widely in jewelry (cabochons, beads), ornamental carvings, industrial mortars and pestles, and as balancing stones in precision instruments.

Geological facts

Ancient Greeks and Romans used it for amulets and signet rings. The 'Eye Agate' variety was believed to protect the wearer from the evil eye.

Field identification & locations

Identify by its translucent nature and distinctive parallel or concentric bands. Commonly found in riverbeds, volcanic ash beds, and lake shores such as the Lake Superior region.