metamorphic

Tumbled dark-green serpentine

Serpentinite; chiefly serpentine-group minerals, commonly antigorite, lizardite, or chrysotile (Mg₃Si₂O₅(OH)₄)

AI-generated identification · may be incorrect

Typically dark green to black, waxy-to-greasy luster, massive and fine-grained, with Mohs hardness about 2.5–4 and specific gravity around 2.5–2.6. The specimen shows polishing, fractures, and mottled green-black veining.

Identified September 16, 2026More metamorphic →

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At a glance

Common name: Tumbled dark-green serpentine
Scientific name: Serpentinite; chiefly serpentine-group minerals, commonly antigorite, lizardite, or chrysotile (Mg₃Si₂O₅(OH)₄)
Category: metamorphic
Identified: September 16, 2026
Method: Standard

AI Estimated Value

About $3–$15 for a common polished/tumbled piece; $20–$100+ for larger, vividly patterned, or locality-labeled 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 ultramafic mantle rocks such as peridotite are hydrated during hydrothermal alteration, commonly along plate boundaries and ancient oceanic crust. Individual serpentinite bodies range from Precambrian to modern geological ages.

Uses & applications

Used as a decorative and carving stone, ornamental aggregate, and historically as a source of asbestos-bearing material; attractive pieces are sold as lapidary specimens and jewelry.

Geological facts

Serpentinite is often mistaken for jade, but it is generally softer and less tough. Chrysotile-bearing varieties can release hazardous fibers when cut or abraded.

Field identification & locations

Identify by its low hardness, waxy feel, dark green color, and inability to scratch glass reliably; common localities include California, Italy, New Zealand, Canada, and the Himalaya. Avoid dry cutting or drilling unless asbestos content is excluded.