![Serpentine-rich metamorphic rock (Serpentinite, primarily serpentine-group minerals [Mg₃Si₂O₅(OH)₄], possibly with magnetite and/or chromite) — metamorphic](https://media.rock.id/serpentine-rich-metamorphic-rock-0127407e-8fbe-4e8f-b1d2-b531c017c086-compressed.jpg)
metamorphic
Serpentine-rich metamorphic rock
Serpentinite, primarily serpentine-group minerals [Mg₃Si₂O₅(OH)₄], possibly with magnetite and/or chromite
AI-generated identification · may be incorrectDark olive-green to gray, mottled and waxy-looking with a dull to greasy luster; typically massive rather than visibly crystalline. Hardness is about 2.5–4 Mohs, with poor cleavage and specific gravity around 2.5–2.6.
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Physical properties
Dark olive-green to gray, mottled and waxy-looking with a dull to greasy luster; typically massive rather than visibly crystalline. Hardness is about 2.5–4 Mohs, with poor cleavage and specific gravity around 2.5–2.6.
Formation & geological history
Forms when ultramafic mantle rocks such as peridotite undergo low-temperature hydrothermal alteration and hydration, commonly along faults and oceanic crust; ages vary widely. The image is insufficient for precise locality or age determination.
Uses & applications
Used as decorative and architectural stone, carvings, countertops, and occasionally jewelry; attractive polished material can have modest collector value.
Geological facts
Serpentinite may contain magnetite, causing weak magnetic response, and may host asbestos-forming minerals; avoid cutting, grinding, or creating dust until professionally tested.
Field identification & locations
Look for a green-black mottled color, unusually soft/waxy surface, and possible magnetism; distinguish it from jade with hardness and laboratory testing. Common in California, Italy, New Zealand, Canada, and ophiolite belts worldwide.
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