metamorphic
Polished green stone, likely serpentine or nephrite jade
Serpentine-group minerals, chiefly antigorite/lizardite; possible nephrite (actinolite–tremolite amphibole)
AI-generated identification · may be incorrectDark green with mottled pale-green veining and a waxy to subvitreous luster; massive, fine-grained texture with no visible crystals. Serpentine is Mohs 2.5–4 and nephrite 6–6.5; specific gravity is approximately 2.5–3.0.
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Physical properties
Dark green with mottled pale-green veining and a waxy to subvitreous luster; massive, fine-grained texture with no visible crystals. Serpentine is Mohs 2.5–4 and nephrite 6–6.5; specific gravity is approximately 2.5–3.0.
Formation & geological history
Formed by metamorphic alteration of ultramafic rocks, commonly during hydrothermal alteration and subduction-related processes; ages vary widely by locality. The elongated shape appears polished or naturally water-worn.
Uses & applications
Serpentine is used for carvings, ornamental stone, and occasionally countertops; tougher nephrite is used for beads, tools, and jewelry. Value depends strongly on confirmed identity, translucency, color, and polish.
Geological facts
Serpentine and nephrite can look very similar, but nephrite is substantially tougher and harder. A laboratory test such as hardness, specific gravity, refractive index, or Raman/XRF analysis is needed for reliable identification.
Field identification & locations
Common sources include California, Vermont, Italy, New Zealand, Canada, China, and Afghanistan. Look for a greasy/waxy feel, green mottling, and softness; avoid acid or destructive tests and do not assume “jade” from appearance alone.
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