metamorphic
Likely nephrite jade pebble
Nephrite, an interlocking amphibole aggregate dominated by tremolite–actinolite, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂
AI-generated identification · may be incorrectSmall, dark green to brown, irregular and glossy, possibly wet or polished; nephrite has Mohs hardness 6–6.5, a tough fibrous texture, and no obvious cleavage. The image alone cannot confirm jade; other dark-green rocks or minerals may look similar.
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Physical properties
Small, dark green to brown, irregular and glossy, possibly wet or polished; nephrite has Mohs hardness 6–6.5, a tough fibrous texture, and no obvious cleavage. The image alone cannot confirm jade; other dark-green rocks or minerals may look similar.
Formation & geological history
Nephrite forms during metamorphism and metasomatism, commonly where silica-rich fluids alter ultramafic rocks; deposits range from ancient to geologically recent.
Uses & applications
Suitable nephrite is carved into ornaments, beads, and jewelry; lower-grade material is collected or used decoratively.
Geological facts
Nephrite is exceptionally tough because its microscopic amphibole fibers interlock; it is one of the two materials traditionally called jade.
Field identification & locations
Check for a waxy-to-greasy luster, substantial heft, and toughness; appearance alone is not diagnostic. Nephrite occurs in places including British Columbia, New Zealand, China, and Siberia.
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