mineral
Banded Agate (specifically Carnelian Agate)
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7.0 (Mohs scale), Color: Orange, brown, and white banded patterns, Luster: Waxy to vitreous, Crystal Structure: Trigonal (microcrystalline/cryptocrystalline quartz), Cleavage: None (conchoidal fracture).
- Hardness
- 6
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Physical properties
Hardness: 6.5-7.0 (Mohs scale), Color: Orange, brown, and white banded patterns, Luster: Waxy to vitreous, Crystal Structure: Trigonal (microcrystalline/cryptocrystalline quartz), Cleavage: None (conchoidal fracture).
Formation & geological history
Formed as a secondary mineral in volcanic rock cavities (vesicles) or sedimentary environments through the deposition of silica from groundwater over long periods, often in Cenozoic era formations.
Uses & applications
Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular collector's gemstone due to its unique patterns.
Geological facts
The name Agate comes from the Achates River in Sicily. Carnelian varieties were used in ancient Rome and Egypt for signet rings and seals because hot wax does not stick to it.
Field identification & locations
Identify in the field by looking for translucent edges, waxy surfaces, and concentric or parallel banding when wet or backlit. Common in gravel pits and beaches worldwide.
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