metamorphic

Likely serpentinite or chlorite-rich metamorphic rock

Serpentinite, commonly dominated by serpentine-group minerals (antigorite/lizardite/chrysotile), possibly with magnetite and chlorite

AI-generated identification · may be incorrect

Dark gray-green, dull to slightly waxy luster, fine-grained and massive with mottled pale veining; estimated Mohs hardness 2.5–4, with no obvious cleavage. Identification is uncertain from the image alone because texture and diagnostic tests are limited.

Identified September 16, 2026More metamorphic →

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At a glance

Common name: Likely serpentinite or chlorite-rich metamorphic rock
Scientific name: Serpentinite, commonly dominated by serpentine-group minerals (antigorite/lizardite/chrysotile), possibly with magnetite and chlorite
Category: metamorphic
Identified: September 16, 2026
Method: Standard

AI Estimated Value

About $1–$15 for a common small rough specimen; $20–$100+ for attractive polished or well-documented 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 are hydrated during hydrothermal alteration, commonly in oceanic crust and subduction zones; ages range from Precambrian to modern tectonic settings.

Uses & applications

Used as decorative stone, carving material, aggregate, and historically as a source of asbestos where chrysotile is present; attractive polished pieces may be collectible.

Geological facts

Serpentinite often contains magnetite and can be weakly magnetic; chrysotile-bearing material should not be cut, ground, or powdered because asbestos fibers may be hazardous.

Field identification & locations

Common in ophiolites and tectonic belts, including California, Italy, New Zealand, and the Appalachians. A green streak, waxy feel, low hardness, and possible magnetism support serpentinite, but laboratory testing is needed for confirmation.