metamorphic
Polished serpentine-rich stone
Serpentinite, primarily serpentine-group minerals (antigorite, lizardite, or chrysotile)
AI-generated identification · may be incorrectUsually Mohs 2.5–4, olive-green to yellow-brown, waxy to greasy luster, fine-grained and massive; commonly has dark veining and irregular fractures. The glossy surface appears polished or wet, obscuring natural texture.
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Physical properties
Usually Mohs 2.5–4, olive-green to yellow-brown, waxy to greasy luster, fine-grained and massive; commonly has dark veining and irregular fractures. The glossy surface appears polished or wet, obscuring natural texture.
Formation & geological history
Forms when ultramafic mantle rocks such as peridotite undergo hydrothermal alteration and hydration, commonly along tectonic plate boundaries and subduction zones. Serpentinite ranges from ancient Precambrian bodies to young active tectonic settings.
Uses & applications
Used as an ornamental and carving stone, lapidary material, countertops, and historically as a source of asbestos-bearing material; this specimen has modest decorative or collecting value.
Geological facts
Its green coloration comes from serpentine minerals and iron alteration products. Some serpentinite contains chrysotile asbestos, so avoid cutting, drilling, or generating dust unless its composition is confirmed.
Field identification & locations
Common in California, Italy, New Zealand, Canada, and ophiolite belts worldwide; field clues include low density, waxy feel, green-brown color, and dark veining. A definitive identification requires hardness, streak, specific gravity, and mineralogical testing.
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