mineral

Polished brown pebble

Unidentified tumbled stone; possibly brown jasper or agate (microcrystalline quartz, SiO₂)

AI-generated identification · may be incorrect

Small, smooth, rounded specimen with a brown-gray color and subdued polish. If quartz-rich, hardness is about 6.5–7 Mohs and luster is waxy to vitreous; the image does not show enough detail to determine its exact mineral or crystal structure.

Identified September 25, 2026More mineral →

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Physical properties

Formation & geological history

Likely a naturally rounded stone polished by tumbling; its original geological formation and age cannot be established from the image.

Uses & applications

Likely used as a decorative or collectible tumbled stone; value depends on identification, size, and quality.

Geological facts

Brown jasper and agate are varieties of microcrystalline quartz, but similar-looking pebbles can be other rocks or minerals.

Field identification & locations

A close view, translucency check, streak, and hardness test would help distinguish quartz varieties from other stones. Common tumbled stones are sold widely; the pictured specimen is too small and indistinct for a precise identification.