metamorphic
Weathered green metamorphic rock, possibly serpentinite or greenstone
Likely serpentinite (serpentine-group minerals) or chlorite/epidote-rich greenschist; exact identification requires testing
AI-generated identification · may be incorrectDull green to gray-green, fine-grained, with rusty yellow-brown weathering and thin platy fracture surfaces. Likely Mohs hardness 2.5–5.5, nonmetallic luster, weak or no cleavage, and variable specific gravity around 2.6–2.7.
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Physical properties
Dull green to gray-green, fine-grained, with rusty yellow-brown weathering and thin platy fracture surfaces. Likely Mohs hardness 2.5–5.5, nonmetallic luster, weak or no cleavage, and variable specific gravity around 2.6–2.7.
Formation & geological history
Probably formed when ultramafic rock was hydrothermally altered to serpentine, or when basalt was metamorphosed under greenschist-facies conditions; age cannot be determined from the image.
Uses & applications
Usually collected as a geological specimen or used locally as decorative stone; serpentinite may be carved, while greenstone can be used as aggregate or ornamental material.
Geological facts
The layered, slab-like appearance and green color are consistent with metamorphic deformation and alteration, but the yellow patch may be surface staining rather than a diagnostic mineral.
Field identification & locations
Commonly found in ophiolites, subduction-zone mélanges, and metamorphic belts. Check streak, hardness, magnetism, acid reaction, and fresh surfaces; laboratory microscopy or XRD is needed for confident identification.
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