metamorphic
Green serpentine-rich rock (probable nephrite/jade-like specimen)
Serpentinite, chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄); possibly minor nephrite amphibole
AI-generated identification · may be incorrectDark green, waxy to slightly vitreous luster, massive and fine-grained with irregular fracture; serpentine hardness is about 2.5–4 Mohs, while nephrite is 6–6.5. The photograph cannot confirm jade, which requires testing for hardness, density, and mineral structure.
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Physical properties
Dark green, waxy to slightly vitreous luster, massive and fine-grained with irregular fracture; serpentine hardness is about 2.5–4 Mohs, while nephrite is 6–6.5. The photograph cannot confirm jade, which requires testing for hardness, density, and mineral structure.
Formation & geological history
Usually forms when ultramafic mantle rocks undergo hydration and metamorphism, commonly in ophiolite belts and subduction zones; ages vary widely from Precambrian to modern tectonic settings.
Uses & applications
Serpentinite is used as decorative stone, carving material, and occasionally aggregate; verified nephrite may be used for jewelry and ornamental carvings.
Geological facts
The rich green color commonly comes from antigorite, lizardite, chrysotile, magnetite, or chromium-bearing minerals. Some serpentinite contains fibrous asbestos minerals, so avoid cutting or generating dust until identified.
Field identification & locations
Common in California, Oregon, Washington, New Zealand, Italy, Canada, and many ophiolite regions. Field clues include unusually low-density green rock, waxy feel, black magnetite specks, and white veining; a professional gemological test is needed to call it jade.
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