metamorphic

Serpentine-rich metamorphic rock

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite and carbonates

AI-generated identification · may be incorrect

Typically green to yellow-green, mottled, waxy to dull luster, and massive rather than visibly crystalline; Mohs hardness about 2.5–4, with poor to absent cleavage and specific gravity roughly 2.5–2.6. The specimen appears rough and possibly weathered, so exact identification from the image is uncertain.

Identified September 20, 2026More metamorphic →

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At a glance

Common name: Serpentine-rich metamorphic rock
Scientific name: Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite and carbonates
Category: metamorphic
Identified: September 20, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a common hand specimen; $30–$150 for attractive polished or strongly patterned 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 hydrate during hydrothermal alteration, commonly in oceanic crust and subduction zones. Formation ages vary widely, from ancient Precambrian bodies to modern tectonic settings.

Uses & applications

Used as decorative stone, carvings, countertops, and historically as a source of asbestos where chrysotile is present; avoid cutting or sanding unknown specimens because fibers may be hazardous.

Geological facts

Serpentinite often contains magnetite and may be weakly magnetic. Its mottled green appearance resembles jade, but it is generally softer and less durable.

Field identification & locations

Look for greasy or waxy green surfaces, dark veining, low hardness, and possible magnetism; common occurrences include California, Italy, New Zealand, Canada, and the Appalachian region. Confirm with hardness, streak, magnetism, and ideally laboratory testing.