metamorphic

Tumbled serpentine-rich altered rock

Serpentinite, likely antigorite/lizardite with accessory carbonate, quartz, or iron oxides

AI-generated identification · may be incorrect

Mohs hardness about 2.5–4; pale green, cream, gray, and brown mottling; waxy to dull luster; massive, fine-grained texture with no visible crystal cleavage. The rounded, polished form indicates tumbling or water wear.

Identified September 15, 2026More metamorphic →

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At a glance

Common name: Tumbled serpentine-rich altered rock
Scientific name: Serpentinite, likely antigorite/lizardite with accessory carbonate, quartz, or iron oxides
Category: metamorphic
Identified: September 15, 2026
Method: Standard

AI Estimated Value

Approximately $3–$20 as a common tumbled specimen; $25–$100+ for unusually patterned, polished, or locality-documented 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

Formed when ultramafic mantle rocks such as peridotite were hydrated and metamorphosed, commonly during oceanic seafloor alteration or mountain-building; exact age and locality cannot be determined from the image.

Uses & applications

Used as an ornamental and carving stone, countertop or tile material, and collector specimen; softer pieces are commonly tumbled for display.

Geological facts

Serpentinite is named for its often snake-skin-like colors and patterns. Some varieties may contain chrysotile asbestos, so avoid cutting, drilling, or generating dust unless tested and handled safely.

Field identification & locations

Identify by its low hardness, pale green coloration, waxy feel, mottled appearance, and tendency to scratch with steel; definitive identification requires hardness, streak, specific gravity, and mineralogical testing. Common in ophiolites and tectonic fault zones worldwide.