metamorphic
Polished nephrite jade
Nephrite jade; interlocking tremolite–actinolite amphibole, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂
AI-generated identification · may be incorrectHardness 6–6.5 Mohs; olive-green to gray-green, waxy to vitreous luster, very tough and typically massive with no visible cleavage. The smooth elongated form is shaped and highly polished rather than naturally crystal-faced.
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Physical properties
Hardness 6–6.5 Mohs; olive-green to gray-green, waxy to vitreous luster, very tough and typically massive with no visible cleavage. The smooth elongated form is shaped and highly polished rather than naturally crystal-faced.
Formation & geological history
Forms by metamorphism and metasomatism of ultramafic or carbonate rocks, commonly in serpentinite zones; deposits range from Paleozoic to younger tectonic settings. The specimen is likely a carved or tumbled ornamental piece.
Uses & applications
Used for carvings, cabochons, beads, handles, and jewelry; its exceptional toughness makes it valuable for durable ornamental objects.
Geological facts
Nephrite is one of the two materials traditionally called jade, the other being jadeite. Iron content produces darker olive-green coloration.
Field identification & locations
Identify by its fibrous, compact texture, greasy/waxy polish, high toughness, and lack of glassy translucence; distinguish from jadeite with testing or laboratory analysis. Common sources include British Columbia, Wyoming, Siberia, Taiwan, New Zealand, and China.
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