metamorphic
Polished green stone, likely serpentine
Serpentinite; principally serpentine-group minerals (chrysotile, lizardite, antigorite), with possible magnetite or carbonate
AI-generated identification · may be incorrectTypically Mohs 2.5–4, opaque to translucent, waxy or greasy luster, dark green to pale green with mottling; commonly massive and lacks visible cleavage. The rounded shape indicates tumbling or polishing.
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Physical properties
Typically Mohs 2.5–4, opaque to translucent, waxy or greasy luster, dark green to pale green with mottling; commonly massive and lacks visible cleavage. The rounded shape indicates tumbling or polishing.
Formation & geological history
Forms when ultramafic mantle rocks are hydrated during metamorphism, commonly along ancient oceanic crust and tectonic boundaries; ages range from Precambrian to modern tectonic settings.
Uses & applications
Used for carvings, ornamental stone, beads, countertops, and decorative objects; softer examples are popular inexpensive lapidary material.
Geological facts
Serpentine is named for its snake-like coloration and texture. Some serpentinite contains asbestos-form minerals, so avoid cutting or generating dust unless its composition is confirmed.
Field identification & locations
Identify by its green mottled appearance, low hardness, waxy feel, and ability to scratch with a steel blade; common sources include California, Italy, New Zealand, Canada, and Afghanistan. The image is blurred, so jade or greenstone are alternatives.
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