metamorphic

Tumbled greenstone (likely serpentine)

Serpentinite; mainly serpentine-group minerals, commonly antigorite, lizardite, or chrysotile

AI-generated identification · may be incorrect

Green, fine-grained, rounded and polished with waxy to subvitreous luster; typically Mohs hardness 2.5–4, poor cleavage, and specific gravity about 2.5–2.6. The image is consistent with serpentine, though visual identification alone is not definitive.

Identified August 12, 2026More metamorphic →

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At a glance

Common name: Tumbled greenstone (likely serpentine)
Scientific name: Serpentinite; mainly serpentine-group minerals, commonly antigorite, lizardite, or chrysotile
Category: metamorphic
Identified: August 12, 2026
Method: Standard

AI Estimated Value

About $2–$15 for a small common tumbled piece; $20–$100+ for unusually patterned, locality-labeled, or well-finished 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 such as peridotite undergo hydration and metamorphism, commonly in oceanic crust and subduction zones; formation ages vary widely from Precambrian to modern tectonic settings.

Uses & applications

Used as ornamental stone, carvings, beads, cabochons, and occasionally architectural stone; attractive specimens have modest lapidary value.

Geological facts

Serpentine commonly shows mottled olive, yellow-green, or dark-green coloring and may resemble jade, but it is generally softer. Chrysotile serpentine is the fibrous asbestos variety and should not be cut or abraded without proper precautions.

Field identification & locations

Likely identification: green color, waxy polish, low hardness, and fine mottling; common sources include California, Italy, New Zealand, Canada, and Afghanistan. A hardness test, streak, and specific-gravity measurement would help distinguish it from jade, nephrite, or green aventurine.