metamorphic

Yellow-green tumbled stone, possibly serpentine

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

AI-generated identification · may be incorrect

Appears opaque, rounded/tumbled, yellow-green, and dull to waxy; likely Mohs hardness 2.5–4, with no visible crystals or cleavage. Identification is uncertain from the blurred image; similar material could be serpentinized rock, calcite, or dyed stone.

Identified September 5, 2026More metamorphic →

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At a glance

Common name: Yellow-green tumbled stone, possibly serpentine
Scientific name: Serpentine-group minerals, commonly antigorite or lizardite; composition approximately Mg₃Si₂O₅(OH)₄
Category: metamorphic
Identified: September 5, 2026
Method: Standard

AI Estimated Value

Typically $1–$10 for a small common tumbled piece; attractive carved or patterned specimens may sell for $20–$100.

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 hydrate during hydrothermal metamorphism, commonly in ophiolites and subduction zones. Most examples are geologically ancient, though formation can occur today.

Uses & applications

Used as ornamental stone, carvings, beads, tabletops, and historically as a jade substitute; some varieties have industrial asbestos-related significance, requiring caution when cutting or grinding.

Geological facts

Serpentine commonly shows mottled green, yellow, brown, or black colors and a greasy or waxy appearance. Fibrous varieties may contain chrysotile asbestos and should not be powdered or inhaled.

Field identification & locations

Look for low hardness, waxy luster, green-yellow mottling, and a pale streak; it should not readily scratch glass. Common sources include California, Italy, New Zealand, Canada, and Afghanistan.