sedimentary

Banded Carnelian Agate

Cryptocrystalline Quartz (SiO2)

AI-generated identification · may be incorrect

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

Identified July 19, 2026More sedimentary →

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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.