metamorphic

Likely serpentine-rich rock (serpentinite)

Serpentinite, composed mainly of serpentine-group minerals (e.g., lizardite, antigorite, or chrysotile); exact identification is uncertain from the image alone

AI-generated identification · may be incorrect

Pale yellow-green, mottled, fine-grained and dull to slightly waxy; serpentine minerals have Mohs hardness about 2.5–5.5 and a platy or fibrous crystal structure. No distinct cleavage or individual crystals are visible.

Identified September 28, 2026More metamorphic →

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At a glance

Common name: Likely serpentine-rich rock (serpentinite)
Scientific name: Serpentinite, composed mainly of serpentine-group minerals (e.g., lizardite, antigorite, or chrysotile); exact identification is uncertain from the image alone
Category: metamorphic
Identified: September 28, 2026
Method: Standard

AI Estimated Value

About $1–$10 for a small, unpolished common fragment; more only if confirmed, unusually attractive, or prepared as a specimen.

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 water alters magnesium-rich ultramafic rocks, commonly at or near tectonic plate boundaries; the specimen’s age and exact formation setting cannot be determined visually.

Uses & applications

Serpentinite is used as decorative or carving stone and as a source of industrial minerals; attractive pieces may be collected, though this fragment appears modest.

Geological facts

Serpentine is a mineral group, not a single mineral, and its color ranges from pale yellow-green to deep green. Chrysotile, one serpentine mineral, is asbestos-form and hazardous when fibers become airborne.

Field identification & locations

The color and mottled texture are consistent with serpentinite, but similar-looking rocks include altered volcanic rocks and other greenstones; confirm with hardness, streak, and laboratory tests. Serpentinite occurs in many ophiolite belts and mountain-building zones worldwide.