gemstone

Banded agate cabochon

Agate, a microcrystalline variety of chalcedony (SiO₂), likely carnelian/white-banded agate

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; translucent orange-red and white concentric banding; vitreous to waxy luster; cryptocrystalline quartz with no visible cleavage; specific gravity about 2.60.

Identified August 18, 2026More gemstone →

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Physical properties

Hardness 6.5–7 Mohs; translucent orange-red and white concentric banding; vitreous to waxy luster; cryptocrystalline quartz with no visible cleavage; specific gravity about 2.60.

Formation & geological history

Forms when silica-rich groundwater deposits successive layers of chalcedony in gas cavities of volcanic rocks, commonly during the Cenozoic or older volcanic episodes. The specimen is polished and shaped, so its natural host rock is not visible.

Uses & applications

Used for cabochons, pendants, beads, carvings, and ornamental objects; durable enough for small decorative and jewelry applications.

Geological facts

Orange coloration is typically caused by iron oxides or hydroxides. Agate banding records repeated changes in fluid chemistry during cavity filling.

Field identification & locations

Identify by translucent waxy quartz, curved or parallel bands, and hardness sufficient to scratch glass; distinguish from glass by its natural irregular banding and cooler, denser feel. Common sources include Brazil, Uruguay, India, Madagascar, and the United States.