metamorphic
Polished dark-green stone, possibly serpentine or nephrite jade
Serpentine-group minerals, commonly antigorite/lizardite; possible nephrite (actinolite–tremolite amphibole)
AI-generated identification · may be incorrectSmooth, polished, opaque deep green with a waxy-to-subvitreous luster; likely hardness 3–6 Mohs and specific gravity about 2.5–3.1. The image is insufficient to confirm crystal structure, cleavage, or exact mineral identity.
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Physical properties
Smooth, polished, opaque deep green with a waxy-to-subvitreous luster; likely hardness 3–6 Mohs and specific gravity about 2.5–3.1. The image is insufficient to confirm crystal structure, cleavage, or exact mineral identity.
Formation & geological history
Serpentine forms when ultramafic mantle rocks undergo hydration and metamorphism; nephrite forms through metamorphic alteration involving amphiboles. These materials range from Precambrian to modern tectonic settings.
Uses & applications
Used as ornamental stone, carvings, beads, cabochons, and decorative objects; nephrite-quality jade can be valuable, while common serpentine is inexpensive.
Geological facts
Green color may result from iron and chromium. “Jade” cannot be confirmed visually: laboratory testing or reliable hardness, density, refractive-index, and microscopic examination is needed.
Field identification & locations
Common sources include New Zealand, Canada, China, Russia, Guatemala, and the United States. Check for uniformity, translucency, scratches, density, and absence of glassy bubbles; a scratch test should be performed only with permission.
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