metamorphic
Likely serpentinite or chlorite-rich metamorphic rock
Serpentinite, commonly dominated by serpentine-group minerals (antigorite/lizardite/chrysotile), possibly with magnetite and chlorite
AI-generated identification · may be incorrectDark gray-green, dull to slightly waxy luster, fine-grained and massive with mottled pale veining; estimated Mohs hardness 2.5–4, with no obvious cleavage. Identification is uncertain from the image alone because texture and diagnostic tests are limited.
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Physical properties
Dark gray-green, dull to slightly waxy luster, fine-grained and massive with mottled pale veining; estimated Mohs hardness 2.5–4, with no obvious cleavage. Identification is uncertain from the image alone because texture and diagnostic tests are limited.
Formation & geological history
Forms when ultramafic mantle rocks such as peridotite are hydrated during hydrothermal alteration, commonly in oceanic crust and subduction zones; ages range from Precambrian to modern tectonic settings.
Uses & applications
Used as decorative stone, carving material, aggregate, and historically as a source of asbestos where chrysotile is present; attractive polished pieces may be collectible.
Geological facts
Serpentinite often contains magnetite and can be weakly magnetic; chrysotile-bearing material should not be cut, ground, or powdered because asbestos fibers may be hazardous.
Field identification & locations
Common in ophiolites and tectonic belts, including California, Italy, New Zealand, and the Appalachians. A green streak, waxy feel, low hardness, and possible magnetism support serpentinite, but laboratory testing is needed for confirmation.
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