metamorphic

Tumbled green stone, likely serpentine

Serpentine-group minerals, chiefly antigorite and/or lizardite; approximate formula Mg₃Si₂O₅(OH)₄

AI-generated identification · may be incorrect

Typically Mohs 2.5–4, pale green to dark mottled green, with waxy to greasy luster and very fine-grained or fibrous structure; no visible cleavage. The rounded, polished form obscures diagnostic texture, and the identification is provisional from the blurred image.

Identified September 4, 2026More metamorphic →

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At a glance

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

AI Estimated Value

Approximately $2–$15 for a small tumbled piece; $20–$100+ for larger, vividly patterned or gem-quality 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 such as peridotite undergo hydration and alteration, commonly in ancient or active tectonic zones; its age varies widely from Precambrian to modern. This specimen has been mechanically tumbled and polished.

Uses & applications

Used as decorative stone, carvings, beads, cabochons, and ornamental objects; historically used as a jade substitute. Serpentine is generally inexpensive, though attractive patterned pieces may be collectible.

Geological facts

Common look-alikes include nephrite jade, bowenite, chrysoprase, and green calcite. Some serpentine varieties contain chrysotile asbestos, so avoid cutting, drilling, or generating dust unless tested and handled professionally.

Field identification & locations

Field clues include low hardness, waxy feel, green mottling, and association with ultramafic rocks; a steel knife may scratch it, unlike jade. Common localities include California, New Zealand, Italy, Canada, Russia, and Afghanistan.