sedimentary
Banded Agate
Cryptocrystalline Quartz (SiO2)
Hardness: 6.5-7 on Mohs scale. Color: Translucent to opaque with white, pink, and brown bands. Luster: Waxy to vitreous. Crystal Structure: Hexagonal (trigonal) microscopic fibers. Cleavage: None (conchoidal fracture).
- Hardness
- 6
- Color
- Translucent to opaque with white, pink, and brown bands
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 on Mohs scale. Color: Translucent to opaque with white, pink, and brown bands. Luster: Waxy to vitreous. Crystal Structure: Hexagonal (trigonal) microscopic fibers. Cleavage: None (conchoidal fracture).
Formation & geological history
Formed primarily in volcanic rock cavities or ancient sedimentary layers where silica-rich groundwater deposited layers of chalcedony over time.
Uses & applications
Used extensively in jewelry, ornamental carvings, tumbling, and historically for precision tools or mechanical pivots.
Geological facts
Agate is named after the Achates River in Sicily where it was first discovered in ancient times. The banding patterns represent different stages of mineral deposition.
Field identification & locations
Identified by its distinctive parallel banding and translucency. Common in riverbeds, lake shores (like Lake Superior), and volcanic regions globally. Collectors look for sharp, high-contrast bands.
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