metamorphic
Polished serpentinite (likely)
Serpentinite; chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), commonly with magnetite and chromite
AI-generated identification · may be incorrectTypically Mohs 2.5–4, olive-green to yellow-brown, waxy to greasy luster, fine-grained and massive; the dark branching veins may be magnetite, chromite, or altered fracture zones. Exact identification is uncertain from an image alone.
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Physical properties
Typically Mohs 2.5–4, olive-green to yellow-brown, waxy to greasy luster, fine-grained and massive; the dark branching veins may be magnetite, chromite, or altered fracture zones. Exact identification is uncertain from an image alone.
Formation & geological history
Forms when ultramafic mantle rocks such as peridotite undergo hydrothermal alteration and hydration, commonly in oceanic crust and subduction mélanges; ages range from Precambrian to modern tectonic settings.
Uses & applications
Used as decorative stone, carvings, cabochons, countertops, and polished specimens; historically used for architectural facing and ornamental objects.
Geological facts
Its mottled, veined appearance can resemble jade, but serpentinite is generally softer and less dense. Some varieties contain asbestos-form serpentine minerals, so avoid cutting or generating dust without proper controls.
Field identification & locations
Look for a smooth waxy surface, green-yellow coloration, dark veining, low hardness, and a relatively low density; common sources include California, Italy, New Zealand, Canada, and the Ural Mountains. A hardness and specific-gravity test would improve confirmation.
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