mineral

Tumbled greenstone-like pebble

Likely serpentine or chlorite-rich metamorphic rock; exact identification requires testing

AI-generated identification · may be incorrect

Olive-gray, rounded and smoothly worn, with a dull to waxy luster and possible yellow mineral patches. Likely hardness about 2.5–5.5 Mohs, no visible cleavage, and fine-grained texture.

Identified August 21, 2026More mineral →

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Physical properties

Olive-gray, rounded and smoothly worn, with a dull to waxy luster and possible yellow mineral patches. Likely hardness about 2.5–5.5 Mohs, no visible cleavage, and fine-grained texture.

Formation & geological history

Probably a naturally weathered or tumbled fragment of altered ultramafic rock, formed by hydrothermal metamorphism of mantle-derived peridotite; age depends on its source locality.

Uses & applications

Primarily a decorative or lapidary specimen; similar serpentine materials are used for carvings, ornaments, countertops, and collector stones.

Geological facts

The green color may come from serpentine minerals, chlorite, epidote, or iron-bearing alteration products. The photograph alone cannot reliably distinguish serpentine from other green metamorphic rocks.

Field identification & locations

Common possibilities include serpentine, greenstone, nephrite-like material, or altered basalt. Check streak, hardness, density, translucency, and reaction to dilute hydrochloric acid; a gemological or X-ray test is needed for confident identification.