metamorphic

Serpentine (polished/tumbled)

Serpentine-group minerals, chiefly antigorite, Mg₃Si₂O₅(OH)₄

AI-generated identification · may be incorrect

Typically olive-green to yellow-green with dark veining, waxy to greasy luster, and mottled patterns; Mohs hardness 2.5–4, generally massive rather than visibly crystalline, with poor cleavage. The rounded, glossy specimen is consistent with polished serpentine, though exact identification requires testing.

Identified August 13, 2026More metamorphic →

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Physical properties

Formation & geological history

Forms when ultramafic rocks such as peridotite undergo low-temperature hydration and alteration; many deposits formed during the Paleozoic–Mesozoic and younger tectonic events. Common sources include California, Vermont, New Zealand, Italy, Canada, and Afghanistan.

Uses & applications

Used as an ornamental stone, carvings, beads, cabochons, and decorative tile; historically used for architectural facing. Avoid prolonged dust exposure because some serpentinite deposits can contain asbestos-forming minerals.

Geological facts

Serpentine is California’s state rock and gives its name to serpentinite, a rock composed largely of serpentine minerals. Its green color and dark mesh-like veining can resemble jade, but it is much softer.

Field identification & locations

Identify by its low hardness, waxy feel, green mottling, and ability to scratch with a steel knife; it should not scratch glass. The image could also represent a related greenstone or nephrite, so laboratory analysis is needed for certainty.