metamorphic

Likely serpentine-rich metamorphic rock

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, or chrysotile), with possible magnetite and minor chlorite/talc

AI-generated identification · may be incorrect

Dark olive-green to brown, mottled, earthy to waxy luster, and fine-grained massive texture; Mohs hardness about 2.5–4, commonly with uneven fracture and no obvious cleavage. The image alone cannot confirm mineral identity or distinguish it from altered ultramafic rock.

Identified September 5, 2026More metamorphic →

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At a glance

Common name: Likely serpentine-rich metamorphic rock
Scientific name: Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, or chrysotile), with possible magnetite and minor chlorite/talc
Category: metamorphic
Identified: September 5, 2026
Method: Standard

AI Estimated Value

About $2–$15 for a small common fragment; $20–$100+ for polished, patterned, or unusually attractive specimens.

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 mantle-derived peridotite is hydrated and metamorphosed, commonly along tectonic plate boundaries and subduction zones. Serpentinization is mostly Mesozoic to Cenozoic in exposed belts, though individual bodies may be older.

Uses & applications

Used as decorative stone, carving material, and occasionally crushed aggregate; attractive pieces may be sold as lapidary specimens, though chrysotile-bearing material should not be cut or powdered.

Geological facts

Serpentinite commonly contains magnetite and may be weakly magnetic; its green color and slick or waxy surfaces are characteristic. Some varieties are associated with asbestos-forming chrysotile.

Field identification & locations

Common in ophiolites and tectonic belts, including California, the Appalachians, New Zealand, Italy, and Greece. Field tests include a waxy green appearance, relatively low hardness, and possible magnetism; professional testing is needed for certainty.