metamorphic

Likely serpentine

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

AI-generated identification · may be incorrect

Typically olive to yellow-green, waxy to greasy luster, opaque, Mohs hardness 2.5–4, poor cleavage, and massive or fibrous texture. The photograph is insufficient for a definitive identification; it could also be another green altered rock.

Identified September 3, 2026More metamorphic →

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Physical properties

Formation & geological history

Forms when ultramafic rocks such as peridotite undergo low-temperature hydration and metamorphism, commonly in oceanic crust and subduction zones. Serpentinization occurs from the Precambrian to the present.

Uses & applications

Used as decorative stone, carvings, aggregate, and historically for asbestos-bearing materials; attractive polished pieces are collected, though fibrous varieties should not be cut or disturbed.

Geological facts

Serpentine is a mineral-group name rather than one single mineral, and it is the state rock of California. Chrysotile, a serpentine mineral, is the principal asbestos variety.

Field identification & locations

Look for a soft, green, waxy, lightweight stone that may scratch with a steel knife and often shows mottling or veining. Common sources include California, Italy, New Zealand, Canada, and the Ural Mountains.