metamorphic
Tumbled serpentine
Serpentine-group minerals, chiefly lizardite and antigorite; approximate formula Mg₃Si₂O₅(OH)₄
AI-generated identification · may be incorrectTypically pale to dark green, waxy to greasy luster, massive rather than visibly crystalline, Mohs hardness about 2.5–4, and specific gravity 2.5–2.6. The rounded, polished form and mottled green color are consistent with serpentine, though the photograph alone cannot exclude green soapstone or low-grade jade-like mate…
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Physical properties
Typically pale to dark green, waxy to greasy luster, massive rather than visibly crystalline, Mohs hardness about 2.5–4, and specific gravity 2.5–2.6. The rounded, polished form and mottled green color are consistent with serpentine, though the photograph alone cannot exclude green soapstone or low-grade jade-like material.
Formation & geological history
Forms when magnesium-rich ultramafic rocks such as peridotite undergo hydration and alteration, commonly in former oceanic crust and subduction zones. It ranges from Precambrian to modern geologic settings.
Uses & applications
Used as a decorative stone, carving material, ornamental aggregate, and occasionally jewelry; quality varies greatly and it is generally inexpensive as a small tumbled stone.
Geological facts
Serpentine is a rock-forming mineral group rather than one single mineral species. Some specimens may contain chrysotile asbestos, so avoid cutting, drilling, or generating dust unless composition is verified.
Field identification & locations
Identify by its green mottling, low hardness, waxy feel, and ability to scratch with a steel blade; it should not scratch glass. Common localities include California, Italy, Canada, New Zealand, and the Ural Mountains.
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