mineral

Tumbled brown agate

Chalcedony (microcrystalline quartz, SiO₂), likely agate

AI-generated identification · may be incorrect

Opaque to slightly translucent brown and cream banding with a waxy luster; trigonal quartz structure. Mohs hardness 6.5–7; cleavage absent, specific gravity about 2.6.

Identified October 7, 2026More mineral →

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Physical properties

Opaque to slightly translucent brown and cream banding with a waxy luster; trigonal quartz structure. Mohs hardness 6.5–7; cleavage absent, specific gravity about 2.6.

Formation & geological history

Silica-rich fluids deposited successive layers in cavities or fractures, later solidifying as chalcedony; agates form in volcanic and other rocks across many geological ages.

Uses & applications

Used for jewelry, ornaments, and lapidary crafts; this small tumbled piece has modest decorative and collector value.

Geological facts

Agate’s fine, intergrown quartz crystals are too small to see individually; polishing enhances its natural color patterns.

Field identification & locations

Look for waxy luster, hardness sufficient to scratch glass, and curved or irregular bands. Agate occurs worldwide, including Brazil, Uruguay, India, and the western United States.