metamorphic

Tumbled serpentine

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite and minor carbonate

AI-generated identification · may be incorrect

Dark olive-green to gray-green, mottled and waxy to slightly greasy luster; rounded by tumbling and lacking visible crystal faces. Serpentine hardness is about 2.5–4 Mohs, with variable specific gravity around 2.5–2.6; cleavage is poor to indistinct.…

Identified September 21, 2026More metamorphic →

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At a glance

Common name: Tumbled serpentine
Scientific name: Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite and minor carbonate
Category: metamorphic
Identified: September 21, 2026
Method: Standard

AI Estimated Value

About $3–$20 for a common tumbled specimen; $20–$100+ for unusually patterned, polished, or locality-labeled 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 rocks such as peridotite undergo hydration and metamorphism, commonly along oceanic crust, subduction zones, and fault zones. Serpentinite ranges from ancient Precambrian examples to active modern tectonic settings.

Uses & applications

Used as ornamental and carving stone, tumbled stone, tile, and historically for architectural decoration; attractive green varieties may be sold as “serpentine jade.” Avoid cutting or grinding unknown material because some serpentinite can contain fibrous chrysotile asbestos.

Geological facts

Its green color comes from iron-bearing serpentine minerals, while dark specks may be magnetite. It is often confused with nephrite jade, but serpentine is generally softer and less tough.

Field identification & locations

Look for a smooth waxy surface, mottled green color, low hardness, and occasional magnetism. Common sources include California, Italy, New Zealand, Canada, and ultramafic belts worldwide.