mineral

Tumbled blue-green stone, likely serpentine or green jasper

Probable serpentine-group mineral (Mg₃Si₂O₅(OH)₄) or microcrystalline quartz (SiO₂); exact identification requires testing

AI-generated identification · may be incorrect

Dark blue-green, opaque to slightly translucent, polished vitreous-to-waxy luster with mottled yellow-green areas; likely hardness 3–7 Mohs depending on composition, with no visible cleavage. Rounded shape indicates tumbling and polishing.

Identified August 23, 2026More mineral →

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At a glance

Common name: Tumbled blue-green stone, likely serpentine or green jasper
Scientific name: Probable serpentine-group mineral (Mg₃Si₂O₅(OH)₄) or microcrystalline quartz (SiO₂); exact identification requires testing
Category: mineral
Identified: August 23, 2026
Method: Standard

AI Estimated Value

Typically $2–$15 for a common polished stone; unusual color, pattern, or large high-quality cabochons may sell for $20–$75.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Serpentine forms when ultramafic rocks such as peridotite are hydrothermally altered; jasper forms from silica-rich fluids replacing or cementing sediment. These materials commonly formed during ancient tectonic and hydrothermal events.

Uses & applications

Used as a decorative tumbled stone, cabochon, ornamental object, and sometimes carving material; serpentine is also used for architectural stone, while jasper is popular in jewelry.

Geological facts

The image alone cannot reliably distinguish serpentine from jasper, nephrite, or dyed agate. A hardness test, streak, specific gravity, and magnified examination would improve identification.

Field identification & locations

Common sources include California, New Zealand, Afghanistan, Russia, Brazil, and India. Serpentine is generally softer and waxier; jasper is harder and scratches glass, while a steel nail may scratch serpentine.