mineral
Banded Agate
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Hardness: 6.5-7 on Mohs scale; Color: Greyish-brown, tan, translucent white bands; Luster: Waxy to vitreous; Crystal system: Trigonal (microcrystalline); Cleavage: None, exhibits conchoidal fracture
- Hardness
- 6
- Color
- Greyish-brown, tan, translucent white bands
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Greyish-brown, tan, translucent white bands; Luster: Waxy to vitreous; Crystal system: Trigonal (microcrystalline); Cleavage: None, exhibits conchoidal fracture
Formation & geological history
Formed by the slow deposition of silica from groundwater within cavities inside volcanic rocks (such as basalt) or sedimentary host rocks over millions of years.
Uses & applications
Used in lapidary work, tumbling, cabochon cutting for jewelry, ornamental carving, and mineral collections.
Geological facts
Agate bands are formed as successive layers of silica-rich fluid deposit inside gas bubbles in cooling lava. No two agates have the exact same pattern.
Field identification & locations
Look for distinct parallel or concentric banding with a smooth, waxy feel and shell-like (conchoidal) fracture edges. Commonly found along gravel bars, riverbeds, and beaches near volcanic areas.
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