mineral
Banded Agate
Silicon Dioxide (SiO2)
Hardness: 6.5-7 on Mohs scale; Color: Gray, tan, white, and translucent bands; Luster: Waxy to vitreous; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.64.
- Hardness
- 6
- Color
- Gray, tan, white, and translucent bands
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Gray, tan, white, and translucent bands; Luster: Waxy to vitreous; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.64.
Formation & geological history
Formed as a secondary mineral in volcanic rock cavities (vesicles) where silica-rich groundwater deposits layers of microcrystalline quartz over thousands of years.
Uses & applications
Used primarily for jewelry (cabochons), ornamental carvings, lapidary art, and as a semi-precious gemstone for collectors.
Geological facts
Agate is named after the Achates River in Sicily. The concentric banding is actually rhythmic crystallization that creates the distinct 'ring' patterns.
Field identification & locations
Identify in the field by looking for translucent edges, waxy texture, and fine concentric banding. Common in volcanic regions and riverbeds.
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