metamorphic

Polished green serpentine (likely bowenite)

Serpentine-group minerals, chiefly antigorite and/or lizardite; bowenite is a compact, nickel-bearing serpentine variety

AI-generated identification · may be incorrect

Typically pale to dark green with fibrous or banded veining, waxy to greasy luster, and smooth polish; Mohs hardness 2.5–4, monoclinic/triclinic crystal structure, poor cleavage, and specific gravity about 2.5–2.6. The rounded shape is human-polished and the specimen may also resemble green nephrite or soapstone.

Identified August 14, 2026More metamorphic →

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At a glance

Common name: Polished green serpentine (likely bowenite)
Scientific name: Serpentine-group minerals, chiefly antigorite and/or lizardite; bowenite is a compact, nickel-bearing serpentine variety
Category: metamorphic
Identified: August 14, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a common polished piece; $30–$150+ for large, attractive, translucent bowenite or finely carved 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 rocks such as peridotite undergo hydrothermal alteration and hydration, commonly during oceanic-crust or mountain-building processes; ages range from Precambrian to modern tectonic settings.

Uses & applications

Used for ornamental carvings, beads, cabochons, decorative stone, and occasionally countertops; high-quality translucent bowenite is collectible but generally less valuable than jade.

Geological facts

Serpentine can show asbestos-form minerals, so avoid cutting, drilling, or generating dust unless its composition is confirmed. It is commonly confused with jade because of its green color and polish.

Field identification & locations

Common in California, Vermont, New Zealand, Italy, Russia, Canada, and Afghanistan; field clues include low hardness, waxy feel, green veining, and scratching by steel. Definitive separation from jade requires hardness, density, microscopy, or laboratory testing.