gemstone
Banded Agate
Cryptocrystalline Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 6.5–7 (Mohs scale), Color: Translucent gray and white bands, Luster: Vitreous/Waxy, Structure: Cryptocrystalline Quartz, Cleavage: None, Specific Gravity: 2.58–2.64
- Hardness
- 6
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Physical properties
Hardness: 6.5–7 (Mohs scale), Color: Translucent gray and white bands, Luster: Vitreous/Waxy, Structure: Cryptocrystalline Quartz, Cleavage: None, Specific Gravity: 2.58–2.64
Formation & geological history
Formed primarily in volcanic rock cavities or sedimentary geodes through the deposition of silica from groundwater into concentric layers over thousands of years.
Uses & applications
Used extensively in jewelry, lapidary arts, decorative ornaments, and historically for burnishing tools and mortars/pestles due to its hardness.
Geological facts
The unique banding is caused by rhythmic crystallization of silica; no two agates are exactly alike. They have been used as amulets and ornaments since the era of ancient Babylon.
Field identification & locations
Identified by concentric rhythmic banding and translucency. Commonly found in Brazil, Uruguay, and various riverbeds or volcanic regions worldwide. Collectors look for clarity and sharp band contrast.
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