metamorphic

Polished green stone, likely serpentine or nephrite jade

Serpentine-group minerals (commonly antigorite/lizardite) or nephrite, a fibrous tremolite–actinolite aggregate

AI-generated identification · may be incorrect

Rounded, polished cabochon with mottled dark- and pale-green coloration and a waxy to vitreous luster. Serpentine hardness is about 2.5–4 Mohs; nephrite is tougher and about 6–6.5 Mohs. Crystal structure is generally not visible in this polished piece.

Identified September 5, 2026More metamorphic →

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At a glance

Common name: Polished green stone, likely serpentine or nephrite jade
Scientific name: Serpentine-group minerals (commonly antigorite/lizardite) or nephrite, a fibrous tremolite–actinolite aggregate
Category: metamorphic
Identified: September 5, 2026
Method: Standard

AI Estimated Value

About $2–$15 for common polished serpentine; roughly $20–$150+ if confirmed quality nephrite jade, depending on color, translucency, size, and workmanship.

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

Most consistent with a tumbled or carved metamorphic stone formed by alteration of ultramafic rocks (serpentine) or by metamorphism of magnesium-rich rocks (nephrite). The photograph cannot establish geological age.

Uses & applications

Used for carvings, cabochons, beads, ornaments, and occasionally architectural stone. Serpentine is common and decorative; true nephrite may have jewelry value.

Geological facts

The image shows a finished, human-polished specimen rather than a natural outcrop fragment. Its exact identity cannot be confirmed visually without hardness, density, translucency, or laboratory testing.

Field identification & locations

The green color and mottling favor serpentine; exceptional toughness, smoother even green color, and higher hardness would favor nephrite jade. Near 47°N, 124°W (coastal Washington), serpentinite and related metamorphic rocks are geologically plausible. Test inconspicuously: steel scratches serpentine but usually not nephrite; avoid destructive testing if valuable.