metamorphic

Tumbled dark-green stone, possibly serpentine

Undetermined; serpentine-group rock (predominantly serpentine minerals) is a tentative visual identification

AI-generated identification · may be incorrect

Smooth, rounded, opaque dark-green to gray surface with a subdued luster; exact hardness, cleavage, crystal structure, and specific gravity cannot be determined from the image. Serpentine typically has Mohs hardness 2.5–5.5 and a fine-grained, massive texture.

Identified September 25, 2026More metamorphic →

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Physical properties

Formation & geological history

If serpentine, it formed when water altered magnesium-rich rocks, commonly in ancient oceanic crust and mountain belts; its age depends on the source rock. The specimen appears mechanically tumbled and polished.

Uses & applications

Tumbled serpentine is used for ornaments, beads, and collecting; some varieties are carved or used as decorative stone.

Geological facts

Color and polish alone are insufficient to distinguish serpentine from other green stones such as nephrite, aventurine, or dyed material.

Field identification & locations

A close examination of hardness, density, translucency, and mineral texture is needed for identification; serpentine occurs worldwide in ultramafic-rock belts. The image provides no reliable locality information.