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 incorrectRounded, 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.
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Physical properties
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.
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.
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