metamorphic
Tumbled serpentine
Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; commonly Mg₃Si₂O₅(OH)₄
AI-generated identification · may be incorrectUsually olive to yellow-green with mottling, waxy to greasy luster, and smooth rounded surfaces from tumbling; Mohs hardness 2.5–4, typically massive rather than visibly crystalline, with poor cleavage. The image is consistent with serpentine, though visual identification alone is not definitive.
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Physical properties
Usually olive to yellow-green with mottling, waxy to greasy luster, and smooth rounded surfaces from tumbling; Mohs hardness 2.5–4, typically massive rather than visibly crystalline, with poor cleavage. 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 alteration during metamorphism, commonly in ophiolites and subduction zones. Serpentinization ranges from ancient Precambrian terrains to modern seafloor environments.
Uses & applications
Used as ornamental and carving stone, tumbled material, countertops, and historically as a decorative substitute for jade; fibrous chrysotile varieties have asbestos hazards and should not be cut or inhaled.
Geological facts
Its green color comes largely from iron and nickel-bearing serpentine varieties; associated minerals may include magnetite, chromite, talc, and magnesite.
Field identification & locations
Look for low hardness, waxy feel, green mottling, and unusually high density; it may scratch with a steel knife and is generally softer than jade. Common localities include California, Italy, New Zealand, Canada, and Zimbabwe.
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