metamorphic
Polished green serpentinite
Serpentinite, chiefly serpentine-group minerals (antigorite/lizardite/chrysotile), commonly with magnetite and minor carbonate
AI-generated identification · may be incorrectTypically Mohs 2.5–4, waxy to greasy luster, dark olive-green mottled color, massive texture, and no obvious cleavage; specific gravity is about 2.5–2.6. The rounded, glossy surface indicates tumbling or polishing.
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Physical properties
Typically Mohs 2.5–4, waxy to greasy luster, dark olive-green mottled color, massive texture, and no obvious cleavage; specific gravity is about 2.5–2.6. The rounded, glossy surface indicates tumbling or polishing.
Formation & geological history
Forms when ultramafic mantle rocks such as peridotite are hydrothermally altered by water, usually in oceanic crust and subduction-related tectonic zones. Most specimens are geologically ancient, commonly Paleozoic to Mesozoic, though exact age requires locality data.
Uses & applications
Used as ornamental stone, carvings, beads, countertops, and collector specimens; historically some serpentinite varieties were used as a decorative building stone. Fibrous chrysotile-bearing material should not be cut or abraded because of asbestos risk.
Geological facts
The specimen’s green color and cloudy mottling strongly fit serpentinite, but similar appearance can occur in nephrite jade or greenstone. A laboratory mineralogical test is needed for definitive identification.
Field identification & locations
Common in ophiolites and metamorphic belts, including California, Italy, New Zealand, Canada, and the Alps. Field clues include low hardness, waxy feel, mottled green color, and possible magnetism from magnetite.
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