metamorphic
Green serpentine (likely serpentinite)
Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; approximate formula Mg₃Si₂O₅(OH)₄
AI-generated identification · may be incorrectTypically mottled deep green with waxy to greasy luster, low relief, and fibrous, platy, or massive texture; Mohs hardness 2.5–4, no consistent cleavage, and specific gravity about 2.5–2.6. The specimen’s green color and veining are consistent with serpentine, though image-only identification is provisional.
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Physical properties
Typically mottled deep green with waxy to greasy luster, low relief, and fibrous, platy, or massive texture; Mohs hardness 2.5–4, no consistent cleavage, and specific gravity about 2.5–2.6. The specimen’s green color and veining are consistent with serpentine, though image-only identification is provisional.
Formation & geological history
Forms when ultramafic mantle rocks such as peridotite undergo hydration and metamorphism, commonly along tectonic plate boundaries and ancient oceanic crust. Serpentinization occurs from the Precambrian to the present.
Uses & applications
Used as decorative and facing stone, carvings, countertops, and ornamental objects; some varieties are lapidary materials. Fibrous chrysotile serpentine is asbestos-bearing and should not be cut, drilled, or powdered without testing and controls.
Geological facts
Serpentine can resemble jade, but it is softer and lighter. It often contains magnetite, producing dark specks or weak magnetic response.
Field identification & locations
Common in California, Italy, New Zealand, Canada, Russia, and ophiolite belts worldwide; identify by waxy green appearance, softness, and possible white-green veining. A hardness, specific-gravity, or Raman/XRF test can distinguish it from jade.
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