metamorphic
Likely serpentinite
Serpentinite, composed mainly of serpentine-group minerals (e.g., antigorite, lizardite, or chrysotile)
AI-generated identification · may be incorrectGreen to gray-green, mottled and massive with a dull to waxy luster; serpentine minerals have Mohs hardness about 2.5–5.5 and typically lack obvious cleavage. The rough, weathered surface makes visual identification uncertain.
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Physical properties
Green to gray-green, mottled and massive with a dull to waxy luster; serpentine minerals have Mohs hardness about 2.5–5.5 and typically lack obvious cleavage. The rough, weathered surface makes visual identification uncertain.
Formation & geological history
Forms when water alters ultramafic rocks, commonly at or near tectonic plate boundaries and in subduction-related settings; the image alone cannot establish its age.
Uses & applications
Used as decorative and dimension stone, in carvings and landscaping; some serpentinite contains asbestos-forming chrysotile, so avoid cutting or grinding unidentified material.
Geological facts
Serpentinite is a rock, not a single mineral, and its green color comes from serpentine minerals and associated iron-bearing phases.
Field identification & locations
The green, mottled appearance is consistent with serpentinite, but similar-looking rocks include greenstone and altered basalt. Common occurrences include ophiolites and mountain belts; professional mineralogical testing can confirm the identification.
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