metamorphic
Unidentified dark green rock, possibly serpentinite
Serpentinite; chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), identification uncertain from the blurred image
AI-generated identification · may be incorrectDark green, dull to waxy luster, fine-grained and massive; serpentine has Mohs hardness about 2.5–4 and typically no visible crystals. The specimen appears rounded and weathered, but color and texture are insufficient for confident identification.
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Physical properties
Dark green, dull to waxy luster, fine-grained and massive; serpentine has Mohs hardness about 2.5–4 and typically no visible crystals. The specimen appears rounded and weathered, but color and texture are insufficient for confident identification.
Formation & geological history
Serpentinite forms when ultramafic mantle rocks such as peridotite undergo hydration and metamorphism, commonly in oceanic crust and subduction zones; ages vary widely from Precambrian to modern tectonic settings.
Uses & applications
Used as decorative and carving stone, aggregate, and historically as “green marble”; attractive pieces may be collected, though fibrous varieties can contain asbestos minerals.
Geological facts
Common look-alikes include greenstone, basalt, chlorite schist, and weathered copper-bearing rock. A sharp image, streak, hardness test, and specific-gravity or mineral analysis would be needed for confirmation.
Field identification & locations
Common in ophiolite belts and metamorphic terrains, including California, Italy, New Zealand, and Canada. Waxy texture, greasy feel, pale-green streak, and softness support serpentine identification; avoid sawing unknown fibrous material.
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