metamorphic

Serpentinite (likely chlorite–serpentine rock)

Serpentinite; primarily serpentine-group minerals [Mg3Si2O5(OH)4], with possible chlorite, talc, magnetite, and carbonate

AI-generated identification · may be incorrect

Typically Mohs 2.5–4, dark green to gray-green, waxy to slightly greasy luster, massive and commonly mottled or veined; no obvious cleavage. The specimen’s coarse green-gray texture and translucent mineral patches are consistent with serpentinite, though photo identification is not definitive.

Identified August 16, 2026More metamorphic →

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At a glance

Common name: Serpentinite (likely chlorite–serpentine rock)
Scientific name: Serpentinite; primarily serpentine-group minerals [Mg3Si2O5(OH)4], with possible chlorite, talc, magnetite, and carbonate
Category: metamorphic
Identified: August 16, 2026
Method: Standard

AI Estimated Value

$5–$30 for a common rough specimen; $30–$150 for attractive polished or unusually patterned 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

Forms when ultramafic mantle rocks such as peridotite hydrate during low-temperature metamorphism, commonly in oceanic crust and subduction zones. Most examples range from Paleozoic to Mesozoic or younger, depending on the terrane.

Uses & applications

Used as decorative stone, carvings, countertops, and historically as a source rock associated with asbestos minerals; attractive pieces are collected, but fibrous material should not be cut or abraded.

Geological facts

Often contains magnetite, making some pieces weakly magnetic, and may host chromite, nickel, or asbestos-forming minerals. Its green color reflects hydration and alteration of magnesium-rich mantle rock.

Field identification & locations

Look for a soft, heavy, mottled green rock with slick or waxy surfaces and possible veining; it may scratch with a steel knife. Common in alpine ophiolites and fault zones, including California, Italy, New Zealand, and the Appalachians.