metamorphic
Greenstone, likely nephrite jade
Nephrite (interlocking tremolite–actinolite amphibole, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂)
AI-generated identification · may be incorrectPale green, opaque, waxy-to-greasy luster with a smooth, possibly worked surface; Mohs hardness about 6–6.5, tough and fine-grained, with no visible cleavage. The image alone cannot distinguish nephrite confidently from bowenite, serpentine, or pale-green stone.
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Physical properties
Pale green, opaque, waxy-to-greasy luster with a smooth, possibly worked surface; Mohs hardness about 6–6.5, tough and fine-grained, with no visible cleavage. The image alone cannot distinguish nephrite confidently from bowenite, serpentine, or pale-green stone.
Formation & geological history
Nephrite forms by metamorphism and metasomatism of ultramafic or dolomitic rocks, commonly in Paleozoic–Mesozoic mountain belts; its geological age depends on locality.
Uses & applications
Used for carvings, beads, tools, ornaments, and jewelry; high-quality jade is valued for toughness and even color.
Geological facts
Nephrite is exceptionally resistant to breaking because of its felted amphibole fibers. The elongated shape may indicate a carved or tumbled specimen rather than a naturally exposed fragment.
Field identification & locations
Common sources include British Columbia, Wyoming, Siberia, New Zealand, Taiwan, and China. Confirm with refractive index, specific gravity (about 2.9–3.1), microscopy, and hardness testing; avoid destructive tests on suspected jade.
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