metamorphic
Polished serpentine-rich stone (likely serpentine jade/“new jade”)
Serpentinite; chiefly serpentine-group minerals, commonly antigorite, lizardite, or chrysotile, with possible magnetite and carbonate
AI-generated identification · may be incorrectHardness is typically 2.5–4 Mohs, with waxy to greasy luster and rounded, polished surfaces. The specimen is yellow-brown to olive-green with dark mottling; serpentine has a fine-grained, non-visible crystal structure and poor cleavage.
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Physical properties
Hardness is typically 2.5–4 Mohs, with waxy to greasy luster and rounded, polished surfaces. The specimen is yellow-brown to olive-green with dark mottling; serpentine has a fine-grained, non-visible crystal structure and poor cleavage.
Formation & geological history
Forms when ultramafic mantle rocks, especially peridotite, undergo hydration and alteration during metamorphism; most examples are Paleozoic to younger, though the process occurs in many tectonic settings.
Uses & applications
Used as ornamental stone, carvings, beads, tiles, and lapidary material; attractive translucent green varieties are sometimes marketed as “new jade,” though they are not true jadeite or nephrite.
Geological facts
The yellow coloration may result from iron oxidation, while dark patches commonly contain magnetite or other altered minerals. Chrysotile-bearing serpentinite can contain asbestos fibers, so avoid cutting or generating dust unless tested.
Field identification & locations
Identify by its waxy feel, low hardness, green-yellow mottling, and ability to scratch with a steel knife; acid reaction is usually weak or absent. Common in ophiolite belts and tectonic suture zones worldwide, including California, Italy, New Zealand, and the Himalaya.
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