mineral
Banded Agate
Cryptocrystalline Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7 (Mohs); Color: Multi-colored bands (brown, white, grey, beige); Luster: Waxy to vitreous; Crystal structure: Trigonal (microcrystalline); Cleavage: None; SG: 2.58-2.64
- Hardness
- 6
- Color
- Multi-colored bands (brown, white, grey, beige)
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Multi-colored bands (brown, white, grey, beige); Luster: Waxy to vitreous; Crystal structure: Trigonal (microcrystalline); Cleavage: None; SG: 2.58-2.64
Formation & geological history
Formed primarily in volcanic or metamorphic environments when silica-rich groundwater fills gas cavities (vesicles) in igneous rocks. The bands represent different pulses of silica deposition over thousands of years.
Uses & applications
Commonly used in jewelry (cabochons, beads), decorative carvings, precision balances, and as a collectible gemstone for lapidary work.
Geological facts
Agate is named after the Achates River in Sicily. No two agates are exactly alike due to the unique chemical conditions during the formation of each band.
Field identification & locations
Identify in the field by its translucent properties when held to light, conchoidal fracture, and distinct parallel banding. Frequently found in riverbeds, beaches, and volcanic ash deposits.
