metamorphic
Likely weathered gray-green stone, possibly serpentinite
Serpentinite (predominantly serpentine-group minerals; identification uncertain from image)
AI-generated identification · may be incorrectSoft to moderately hard (Mohs ~2.5–4), dull to waxy luster, gray-green color, irregular fractures and heavily weathered texture; may contain magnetite and minor chromite. Crystal grains are too indistinct for confident confirmation.
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Physical properties
Soft to moderately hard (Mohs ~2.5–4), dull to waxy luster, gray-green color, irregular fractures and heavily weathered texture; may contain magnetite and minor chromite. Crystal grains are too indistinct for confident confirmation.
Formation & geological history
Forms when ultramafic mantle rocks, especially peridotite, undergo hydration during metamorphism; occurrences range from Paleozoic to modern tectonic zones. Common in ophiolites and subduction-related belts.
Uses & applications
Used as ornamental stone, carved objects, aggregate, and historically as a heat-resistant material; attractive polished pieces may be sold as decorative stone.
Geological facts
Serpentinite often has a distinctive greasy or waxy feel and may show dark veining. Some varieties contain asbestos-form serpentine minerals, so avoid cutting or generating dust unless tested.
Field identification & locations
Commonly found in tectonic mountain belts, including California, Italy, New Zealand, and Canada. Field confirmation requires a hardness test, streak, density, and ideally mineral or petrographic analysis.
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