metamorphic

Serpentine-rich metamorphic rock

Serpentinite, dominated by serpentine-group minerals (antigorite/lizardite/chrysotile), with possible magnetite and carbonate

AI-generated identification · may be incorrect

Typically olive to dark green, mottled, waxy to greasy luster, and massive rather than visibly crystalline; Mohs hardness is about 2.5–4, with poor cleavage and specific gravity near 2.5–2.6. The specimen appears weathered and granular, but exact identification is limited by the image.

Identified September 10, 2026More metamorphic →

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At a glance

Common name: Serpentine-rich metamorphic rock
Scientific name: Serpentinite, dominated by serpentine-group minerals (antigorite/lizardite/chrysotile), with possible magnetite and carbonate
Category: metamorphic
Identified: September 10, 2026
Method: Standard

AI Estimated Value

About $2–$15 for a common hand specimen; $20–$75 for attractive polished or pattern-rich pieces.

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 hydrothermal alteration and hydration, commonly along faults and subduction zones. Serpentinite may form at various geological ages, from Precambrian to recent tectonic settings.

Uses & applications

Used as decorative stone, carving material, aggregate, and historically as a source of asbestos where chrysotile is present; avoid cutting or grinding unknown specimens because fibers may be hazardous.

Geological facts

Often shows dark magnetite grains and a characteristic green, mottled appearance. It is commonly associated with ophiolites and ancient oceanic crust.

Field identification & locations

Identify by its green color, low hardness, waxy feel, and association with ultramafic rocks; a steel nail may scratch it, while acid usually produces little reaction unless carbonate is present. Common in California, Italy, New Zealand, Canada, and ophiolite belts worldwide.