mineral
Banded Agate
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 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
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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.
