metamorphic

Serpentine-rich metamorphic rock (probable serpentinite)

Serpentinite; chiefly antigorite, lizardite, or chrysotile [Mg3Si2O5(OH)4], with possible talc, carbonate, magnetite, and remnant olivine/pyroxene

AI-generated identification · may be incorrect

Olive-green to yellow-green, mottled and waxy, with uneven granular texture and possible slickensides; Mohs hardness about 2.5–4, nonmetallic luster, poor cleavage, and variable density around 2.5–2.7. The image is consistent with serpentine but cannot confirm mineral species or asbestos content.

Identified September 16, 2026More metamorphic →

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At a glance

Common name: Serpentine-rich metamorphic rock (probable serpentinite)
Scientific name: Serpentinite; chiefly antigorite, lizardite, or chrysotile [Mg3Si2O5(OH)4], with possible talc, carbonate, magnetite, and remnant olivine/pyroxene
Category: metamorphic
Identified: September 16, 2026
Method: Standard

AI Estimated Value

$2–$15 for a small rough common specimen; $20–$100+ if unusually patterned, polished, or gem-quality.

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 hydrate during low-temperature metamorphism near faults, subduction zones, or seafloor hydrothermal systems. Serpentinization is commonly Mesozoic to modern, depending on the tectonic setting.

Uses & applications

Used as ornamental stone, carving material, aggregate, and historically as a source of magnesium; attractive polished pieces are collected. Do not cut, sand, or crush it until chrysotile asbestos has been excluded.

Geological facts

Green coloration commonly reflects iron-bearing serpentine and associated chromian minerals. It may weakly attract a magnet if magnetite is present.

Field identification & locations

Look for greasy/waxy green surfaces, fibrous or scaly texture, low hardness, and association with dark ultramafic rock; a streak, hardness, acid, magnet, and laboratory/SEM test improve identification. Common in ophiolites and Alpine-type serpentinite belts.