metamorphic
Tumbled jade-like stone, likely nephrite jade
Nephrite: fine-grained interlocking tremolite–actinolite, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂
AI-generated identification · may be incorrectHardness 6–6.5 Mohs; pale creamy green, translucent to opaque, with waxy-to-glassy polish and no visible cleavage. The compact fibrous crystal structure gives nephrite exceptional toughness and typically a specific gravity of about 2.9–3.1.
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Physical properties
Hardness 6–6.5 Mohs; pale creamy green, translucent to opaque, with waxy-to-glassy polish and no visible cleavage. The compact fibrous crystal structure gives nephrite exceptional toughness and typically a specific gravity of about 2.9–3.1.
Formation & geological history
Forms when magnesium-rich rocks undergo metamorphism, commonly in serpentinite-associated zones; deposits range from Paleozoic to younger geologic ages. The image shows a small polished or naturally waterworn pebble, so exact identification requires testing.
Uses & applications
Used for carvings, beads, cabochons, tools, ornaments, and jewelry; high-quality jade is valued for toughness and color rather than crystal transparency.
Geological facts
Nephrite and jadeite are the two materials traditionally called jade; nephrite is generally tougher, while jadeite can show brighter emerald-green colors.
Field identification & locations
Common sources include British Columbia, Wyoming, Siberia, China, New Zealand, and Taiwan. Confirm with a refractive-index, specific-gravity, or professional gemological test; visual identification alone cannot exclude serpentine, chalcedony, or dyed stones.
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