metamorphic
Tumbled nephrite jade (likely)
Nephrite jade; fibrous amphibole aggregate, chiefly actinolite–tremolite, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂
AI-generated identification · may be incorrectHardness about 6–6.5 Mohs; dense, very tough, waxy-to-greasy luster, translucent to opaque, with green, olive, and yellow-brown coloration. Its interlocking fibrous crystal structure gives it exceptional toughness and typically hides cleavage.
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Physical properties
Hardness about 6–6.5 Mohs; dense, very tough, waxy-to-greasy luster, translucent to opaque, with green, olive, and yellow-brown coloration. Its interlocking fibrous crystal structure gives it exceptional toughness and typically hides cleavage.
Formation & geological history
Forms when magnesium-rich rocks undergo metamorphism and metasomatic alteration, commonly near serpentinite or ultramafic bodies; deposits range from ancient Precambrian to younger Phanerozoic ages. The rounded shape and polish indicate human tumbling.
Uses & applications
Used for carvings, beads, cabochons, ornaments, and historically tools and ceremonial objects; high-quality vivid, evenly colored material is jewelry-grade.
Geological facts
Nephrite is one of the two materials called jade, the other being jadeite. Iron content commonly produces olive, yellow, or brown-green hues.
Field identification & locations
Common sources include British Columbia, Canada; Wyoming and Alaska; New Zealand; China; and Siberia. Field clues are very high toughness, smooth waxy polish, fibrous appearance, and lack of obvious cleavage; definitive identification requires density, microscopy, or Raman testing.
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