metamorphic

Tumbled serpentine

Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; approximate formula Mg₃Si₂O₅(OH)₄

AI-generated identification · may be incorrect

A pale green-yellow, matte to waxy, irregularly tumbled specimen. Hardness is typically 2.5–4 Mohs, specific gravity about 2.5–2.6, with poor cleavage and commonly massive, fibrous, or finely crystalline texture.

Identified September 13, 2026More metamorphic →

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Physical properties

Formation & geological history

Forms when magnesium-rich ultramafic rocks such as peridotite undergo low-temperature hydration and metamorphism, often in oceanic crust and subduction zones. Serpentinization ranges from ancient Precambrian occurrences to modern tectonic settings.

Uses & applications

Used as ornamental stone, carvings, beads, and decorative tile; historically used for heat-resistant objects. Chrysotile-rich material can contain hazardous asbestos fibers and should not be cut or powdered without proper controls.

Geological facts

Its green color comes from iron and nickel substitution, and surfaces may show mottled veining or greasy luster. The image alone cannot distinguish serpentine confidently from pale green soapstone or altered ultramafic rock.

Field identification & locations

Common in California, Vermont, Quebec, Italy, New Zealand, and many ophiolite belts. A low hardness, waxy feel, green color, and resistance to dilute acid support identification; avoid fiber-generation tests.