mineral

Tumbled green stone, likely serpentine or green aventurine

Most consistent with serpentine-group minerals (often antigorite/lizardite); possibly quartz-rich green aventurine

AI-generated identification · may be incorrect

Polished green, mottled, and translucent to opaque with waxy-to-glassy luster; serpentine hardness 2.5–4 Mohs, aventurine about 7. Crystal structure is typically fine-grained and lacks visible cleavage. The image alone cannot distinguish these reliably.

Identified August 30, 2026More mineral →

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At a glance

Common name: Tumbled green stone, likely serpentine or green aventurine
Scientific name: Most consistent with serpentine-group minerals (often antigorite/lizardite); possibly quartz-rich green aventurine
Category: mineral
Identified: August 30, 2026
Method: Standard

AI Estimated Value

About $2–$15 for a common tumbled piece; $20–$75 if unusually attractive, large, or confirmed as jade-like material.

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 mantle rocks undergo hydration and metamorphism, commonly during tectonic activity; deposits range from ancient to modern geologic settings. Aventurine forms when quartz crystallizes with fuchsite or other green inclusions.

Uses & applications

Used as a decorative tumbled stone, carving material, beads, and inexpensive jewelry; serpentine is also used for ornamental tile and sculpture. Aventurine is popular in cabochons and metaphysical collections.

Geological facts

Serpentine may resemble jade but is generally softer and less dense; green aventurine commonly shows glittering mica (“aventurescence”), which is not obvious here.

Field identification & locations

Check hardness, density, translucency, and sparkle: a steel knife may scratch serpentine but not quartz aventurine; jadeite and nephrite are harder and tougher. Common sources include California, Vermont, Italy, China, India, Brazil, and Russia.