metamorphic
Serpentinite (likely)
Serpentinite, composed mainly of serpentine-group minerals such as antigorite, lizardite, or chrysotile
AI-generated identification · may be incorrectDark green to olive, mottled and waxy-to-greasy luster, with irregular fracture and possible slickensided surfaces. Serpentine minerals are typically Mohs 2.5–5.5; crystal structure and hardness vary with mineral mix.
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Physical properties
Dark green to olive, mottled and waxy-to-greasy luster, with irregular fracture and possible slickensided surfaces. Serpentine minerals are typically Mohs 2.5–5.5; crystal structure and hardness vary with mineral mix.
Formation & geological history
Forms when water alters ultramafic rocks, especially peridotite, during low-temperature hydrothermal or metamorphic processes. This process has occurred throughout geological time in oceanic crust and mountain belts.
Uses & applications
Used as decorative and carving stone, landscaping material, and historically as a source of asbestos-bearing minerals; avoid cutting or grinding unknown serpentinite because fibers may be hazardous.
Geological facts
Serpentinite often has a distinctive green color and may contain veins of magnetite, carbonate, or chrysotile. The pictured specimen’s rough, green, somewhat waxy surface is consistent with serpentinite, though a photo cannot confirm identification.
Field identification & locations
Look for green color, waxy sheen, mottled texture, and relatively soft surfaces; common in ophiolites and tectonic fault zones. The photo does not establish its exact locality or mineral composition.
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