metamorphic
Likely serpentinite (rough green serpentinite rock)
Serpentinite, composed mainly of serpentine-group minerals (e.g., antigorite, lizardite, and chrysotile)
AI-generated identification · may be incorrectThe specimen appears massive, fractured, and pale green to gray, with a dull to slightly waxy luster. Serpentine minerals have Mohs hardness about 2.5–5.5; exact texture and composition cannot be confirmed from the image.
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Physical properties
The specimen appears massive, fractured, and pale green to gray, with a dull to slightly waxy luster. Serpentine minerals have Mohs hardness about 2.5–5.5; exact texture and composition cannot be confirmed from the image.
Formation & geological history
Forms when water alters ultramafic rocks such as peridotite, commonly in oceanic crust and subduction zones. This process has occurred throughout geological history; the specimen’s age cannot be determined visually.
Uses & applications
Serpentinite is used as decorative and carving stone and, historically, as a building material. It may also be collected as a geological specimen.
Geological facts
Serpentinization can release hydrogen and produce distinctive mesh-like textures, though none is clearly identifiable here.
Field identification & locations
The green-gray color and massive, fractured appearance are consistent with serpentinite, but visual identification is uncertain; a hardness test and mineral analysis would help confirm it. Serpentinite occurs in ultramafic belts worldwide, including California, Italy, and New Zealand.
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