metamorphic
Green nephrite jade, polished egg-shaped specimen
Nephrite jade: interlocking tremolite–actinolite amphibole, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂
AI-generated identification · may be incorrectOpaque, mottled dark-green, waxy-to-greasy luster; fibrous, compact texture and no visible cleavage. Mohs hardness 6–6.5; specific gravity about 2.9–3.1. The label appears to identify it as “green nephrite jade,” though its source is not clear.
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Physical properties
Opaque, mottled dark-green, waxy-to-greasy luster; fibrous, compact texture and no visible cleavage. Mohs hardness 6–6.5; specific gravity about 2.9–3.1. The label appears to identify it as “green nephrite jade,” though its source is not clear.
Formation & geological history
Forms when magnesium-rich rocks undergo metamorphism and metasomatic alteration, producing tightly intergrown amphibole fibers. Nephrite deposits span a wide range of geological ages and occur in metamorphic belts and associated river gravels.
Uses & applications
Carved ornaments, beads, cabochons, and decorative objects; its toughness makes it especially suitable for carving.
Geological facts
Nephrite is exceptionally tough because its interlocking fibers resist breaking; it is one of the two materials historically called jade, the other being jadeite.
Field identification & locations
Identify by its compact, fibrous appearance, waxy luster, and high toughness; common sources include China, British Columbia, Siberia, and New Zealand. The pictured polished piece cannot be authenticated from the image alone.
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