metamorphic

Tumbled green stone, likely serpentine

Serpentine-group minerals, commonly antigorite or lizardite; approximate composition Mg₃Si₂O₅(OH)₄

AI-generated identification · may be incorrect

Opaque dark to medium green, waxy to dull luster, fine-grained and irregularly mottled; Mohs hardness about 2.5–4, with no visible crystal faces and poor cleavage. The rounded shape indicates tumbling or polishing.

Identified September 12, 2026More metamorphic →

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At a glance

Common name: Tumbled green stone, likely serpentine
Scientific name: Serpentine-group minerals, commonly antigorite or lizardite; approximate composition Mg₃Si₂O₅(OH)₄
Category: metamorphic
Identified: September 12, 2026
Method: Standard

AI Estimated Value

About $2–$15 for a small common tumbled piece; $20–$100+ for attractive carvings or unusually fine 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

Forms when ultramafic mantle rocks undergo hydration and alteration during metamorphism, commonly in subduction zones and ophiolites; ages vary widely from Precambrian to modern tectonic settings.

Uses & applications

Used as a decorative carving and lapidary material, beads, cabochons, and small polished stones; some serpentine is marketed as “new jade,” though it is not jadeite or nephrite.

Geological facts

Serpentine can resemble jade but is generally softer and lighter. Identification is provisional from the photograph; green aventurine, nephrite, or prehnite are possible alternatives.

Field identification & locations

Common localities include California, Italy, New Zealand, Russia, Canada, and Afghanistan. Check hardness, density, translucency, and streak; avoid inhaling dust because some serpentinite deposits may contain asbestos-forming minerals.