![Likely greenstone (serpentinized rock) (Serpentinite, predominantly serpentine-group minerals [Mg₃Si₂O₅(OH)₄]) — metamorphic](https://media.rock.id/likely-greenstone-serpentinized-rock-da7ee3ae-e98b-4533-bc02-ac7795983c1c-compressed.jpg)
metamorphic
Likely greenstone (serpentinized rock)
Serpentinite, predominantly serpentine-group minerals [Mg₃Si₂O₅(OH)₄]
AI-generated identification · may be incorrectDark green, fine-grained and dull to slightly waxy, with mottled pale spots; serpentine hardness is about 2.5–4 Mohs and specific gravity about 2.5–2.6. The small, low-resolution image prevents confident distinction from chlorite-rich schist or green basalt.
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Physical properties
Dark green, fine-grained and dull to slightly waxy, with mottled pale spots; serpentine hardness is about 2.5–4 Mohs and specific gravity about 2.5–2.6. The small, low-resolution image prevents confident distinction from chlorite-rich schist or green basalt.
Formation & geological history
Usually forms when ultramafic mantle rocks are hydrated and metamorphosed, commonly along oceanic crust and fault zones; ages range from Precambrian to modern tectonic settings.
Uses & applications
Used as ornamental stone, carving material, aggregate, and occasionally for jewelry; quality depends on color, polish, pattern, and absence of asbestos-form serpentine.
Geological facts
Serpentinite can contain chrysotile asbestos, so avoid cutting, drilling, or creating dust unless professionally tested and controlled.
Field identification & locations
Commonly found in ophiolites and tectonic belts, including California, Italy, New Zealand, and the Appalachians. Field clues include green mottling, a smooth/waxy feel, low hardness, and pale streaks; acid reaction is generally absent.
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