mineral

Orange agate (chalcedony), possibly a small tumbled or naturally water-worn piece

Chalcedony, microcrystalline SiO₂; agate is banded chalcedony

AI-generated identification · may be incorrect

Orange, waxy to vitreous luster, Mohs hardness 6.5–7, specific gravity about 2.6; its tiny quartz crystals are too small to see individually. The image does not show clear banding, so the precise variety is uncertain.

Identified October 13, 2026More mineral →

Explore Orange agate (chalcedony), possibly a small tumbled or naturally water-worn piece in the encyclopedia →

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Physical properties

Formation & geological history

Silica-rich fluids deposit chalcedony in cavities and fractures, commonly in volcanic rocks; agates formed in many geological periods. Iron oxides can produce orange coloration.

Uses & applications

Used for beads, cabochons, carvings, ornaments, and collectible specimens; agate is also used for small precision components.

Geological facts

Agate’s distinctive bands form as successive layers of silica accumulate, often around a cavity in volcanic rock.

Field identification & locations

Look for hardness, a waxy sheen, and—when present—curved or concentric bands; common sources include Brazil, Uruguay, India, and the western United States. A small ordinary piece typically sells for about $1–$10 USD.