mineral

Carnelian Agate

Chalcedony (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale), Color: Orange, reddish-orange, brown, Luster: Vitreous to waxy, Crystal structure: Cryptocrystalline, Cleavage: None, Specific gravity: 2.59-2.61

Hardness: 6

Identified September 15, 2026More mineral →

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Physical properties

Hardness: 6.5-7 (Mohs scale), Color: Orange, reddish-orange, brown, Luster: Vitreous to waxy, Crystal structure: Cryptocrystalline, Cleavage: None, Specific gravity: 2.59-2.61

Formation & geological history

Formed from silica-rich fluids depositing in cavities within igneous rocks. The orange to red color is due to iron oxide impurities. Can form in various geological ages.

Uses & applications

Used primarily in jewelry making, ornamental carvings, and as tumbled stones for collectors.

Geological facts

Carnelian was widely used during Roman times to make engraved gems for signet or seal rings for imprinting a seal with wax on correspondence or other important documents.

Field identification & locations

Identify by its translucent to semi-opaque orange-red color and waxy luster. Tumbled specimens like this are common. Often found in Brazil, India, Siberia, and Germany.