metamorphic

Green serpentine or nephrite-like stone

Serpentine-group minerals, chiefly antigorite/lizardite; possibly minor chlorite or actinolite

AI-generated identification · may be incorrect

Dark mottled green, opaque, waxy to dull luster, fine-grained and irregularly fractured; estimated Mohs hardness 2.5–5.5, with no visible crystal faces or cleavage. The image alone cannot reliably distinguish serpentine from nephrite or other green metamorphic rock.

Identified September 17, 2026More metamorphic →

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At a glance

Common name: Green serpentine or nephrite-like stone
Scientific name: Serpentine-group minerals, chiefly antigorite/lizardite; possibly minor chlorite or actinolite
Category: metamorphic
Identified: September 17, 2026
Method: Standard

AI Estimated Value

About $1–$10 for a small common rough piece; $20–$100+ if confirmed as attractive carving-grade serpentine or nephrite.

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

Typically forms when ultramafic rocks undergo low-temperature hydration and metamorphism, commonly in ophiolite belts and subduction-related settings. Formation ages vary widely from Precambrian to recent tectonic alteration.

Uses & applications

Used as carving stone, ornamental material, and historically for tools and small sculptures; attractive nephrite-quality material may be used in jewelry. Ordinary rough pieces generally have little commercial value.

Geological facts

Serpentine is often veined or mottled green and may feel unusually smooth or slightly soapy. Nephrite is tougher and more fibrous, whereas serpentine is generally softer and easier to scratch.

Field identification & locations

Common localities include California, Vermont, New Zealand, Canada, Russia, and Italy. Field tests include checking hardness with a steel knife and examining a fresh surface; definitive identification requires streak, specific gravity, microscopy, or Raman/XRD testing.