mineral

Tumbled stone, possibly green jasper or serpentine

Indeterminate from the photo; likely a jasper (microcrystalline quartz, SiO₂) or serpentine-group material

AI-generated identification · may be incorrect

Smooth, rounded, opaque blue-green stone with tan-brown patches and a subdued polish. Hardness and crystal structure cannot be determined visually; jasper is Mohs 6.5–7, while serpentine is typically 2.5–5.5.

Identified October 4, 2026More mineral →

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Physical properties

Formation & geological history

The specimen has been tumbled and polished from natural stone; its original formation and geological age cannot be identified from the image alone. Jasper forms through silica deposition, while serpentine forms by alteration of ultramafic rocks.

Uses & applications

Tumbled stones are used for collecting, display, and jewelry; jasper is also used for beads and carvings.

Geological facts

Tumbling smooths rough rock mechanically and can make different minerals look similar, so a photograph is insufficient for a reliable species identification.

Field identification & locations

A hardness or streak test and closer inspection of translucency and texture would help distinguish jasper from softer serpentine. Both occur in many regions worldwide.