sedimentary
Banded Carnelian Agate
Cryptocrystalline Quartz (SiO2)
Hardness: 6.5-7 on Mohs scale; Color: Orange-yellow with white banding; Luster: Waxy to vitreous; Structure: Cryptocrystalline (microscopic crystals); Translucent to semi-opaque.
- Hardness
- 6
- Color
- Orange-yellow with white banding
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Orange-yellow with white banding; Luster: Waxy to vitreous; Structure: Cryptocrystalline (microscopic crystals); Translucent to semi-opaque.
Formation & geological history
Formed in cavities within volcanic or sedimentary rocks where silica-rich fluids deposited layers over time. The location coordinates point to Sudan, which features widespread Nubian Sandstone and volcanic outcrops where agates are common.
Uses & applications
Used extensively in jewelry as gemstones, for ornamental carvings, and historical use in seal stones and beads.
Geological facts
Carnelian is flavored by iron oxide impurities. This specific piece shows 'parallaxis' or concentric banding characteristic of agates found in riverbeds or arid desert plains.
Field identification & locations
Identify by looking for translucent edges, a waxy feel, and characteristic concentric or parallel banding when held to a light. Found in desert 'regs' or dry river valleys.
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