metamorphic
Tumbled greenstone (likely serpentine)
Serpentinite; mainly serpentine-group minerals, commonly antigorite, lizardite, or chrysotile
AI-generated identification · may be incorrectGreen, fine-grained, rounded and polished with waxy to subvitreous luster; typically Mohs hardness 2.5–4, poor cleavage, and specific gravity about 2.5–2.6. The image is consistent with serpentine, though visual identification alone is not definitive.
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Physical properties
Green, fine-grained, rounded and polished with waxy to subvitreous luster; typically Mohs hardness 2.5–4, poor cleavage, and specific gravity about 2.5–2.6. The image is consistent with serpentine, though visual identification alone is not definitive.
Formation & geological history
Forms when ultramafic mantle rocks such as peridotite undergo hydration and metamorphism, commonly in oceanic crust and subduction zones; formation ages vary widely from Precambrian to modern tectonic settings.
Uses & applications
Used as ornamental stone, carvings, beads, cabochons, and occasionally architectural stone; attractive specimens have modest lapidary value.
Geological facts
Serpentine commonly shows mottled olive, yellow-green, or dark-green coloring and may resemble jade, but it is generally softer. Chrysotile serpentine is the fibrous asbestos variety and should not be cut or abraded without proper precautions.
Field identification & locations
Likely identification: green color, waxy polish, low hardness, and fine mottling; common sources include California, Italy, New Zealand, Canada, and Afghanistan. A hardness test, streak, and specific-gravity measurement would help distinguish it from jade, nephrite, or green aventurine.
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