metamorphic
Tumbled green-and-white stone, likely serpentine
Serpentinite; mainly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnesite or talc
AI-generated identification · may be incorrectTypically pale to dark green with mottled white patches, waxy to greasy luster, fine-grained texture, and no visible crystals; Mohs hardness is about 2.5–4, with variable specific gravity around 2.5–2.6. The rounded shape indicates tumbling or polishing.
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Physical properties
Typically pale to dark green with mottled white patches, waxy to greasy luster, fine-grained texture, and no visible crystals; Mohs hardness is about 2.5–4, with variable specific gravity around 2.5–2.6. The rounded shape indicates tumbling or polishing.
Formation & geological history
Forms when ultramafic mantle rocks such as peridotite hydrate during metamorphism, commonly along oceanic crust and tectonic plate boundaries. Individual specimens may be geologically ancient, but age cannot be determined from the image.
Uses & applications
Used as an ornamental stone, carving material, polished pebble, and occasionally as a decorative building stone; softer pieces are unsuitable for heavy-wear jewelry.
Geological facts
Serpentine is not one mineral but a group dominated by antigorite, lizardite, or chrysotile. Some varieties can resemble jade, but serpentine is generally softer and less dense.
Field identification & locations
Identify by its mottled green color, waxy feel, low hardness, and often fibrous or veined appearance; it commonly occurs in California, Vermont, Italy, New Zealand, Canada, and ultramafic belts worldwide. Avoid grinding unknown material because some serpentine may contain chrysotile asbestos.
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