mineral
Banded Chalcedony (Agate)
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7 (Mohs); Color: translucent white to amber; Luster: waxy to vitreous; Crystal Structure: Cryptocrystalline; Cleavage: none; Fracture: conchoidal
- Hardness
- 6
- Color
- translucent white to amber
- Luster
- waxy to vitreous
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Physical properties
Hardness: 6.5-7 (Mohs); Color: translucent white to amber; Luster: waxy to vitreous; Crystal Structure: Cryptocrystalline; Cleavage: none; Fracture: conchoidal
Formation & geological history
Forms primarily in volcanic and sedimentary rocks where silica-rich groundwater fills cavities and precipitates in layered deposits over thousands of years.
Uses & applications
Used widely in lapidary work, jewelry making, ornamental carvings, and as a collector's specimen. Historically used for making tools and seals.
Geological facts
The banding in agate is caused by periodic changes in the concentration of silica and impurities during its formation inside volcanic vesicles.
Field identification & locations
Identify by its waxy texture, translucency, and conchoidal fracture. Often found as nodules in stream beds or weathered volcanic landscapes.
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Septarian Pebble
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