metamorphic

Polished serpentine (likely green serpentine)

Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; composition varies

AI-generated identification · may be incorrect

Olive-green to yellow-green with dark mottling and a polished, waxy-to-greasy luster. Serpentine minerals have Mohs hardness about 2.5–5.5 and commonly form fine-grained, massive material; the exact mineral cannot be confirmed from the photo.

Identified October 9, 2026More metamorphic →

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Physical properties

Formation & geological history

Forms when magnesium-rich ultramafic rocks are altered by water during serpentinization, often in mountain belts and along faults. This process has occurred throughout geological time.

Uses & applications

Carved ornaments, beads, and inexpensive jewelry; some varieties are used as decorative stone. Avoid cutting or abrading unknown material, since certain serpentine rocks may contain fibrous asbestos minerals.

Geological facts

“Serpentine” names a mineral group and the rock largely composed of it; color and hardness vary substantially among varieties.

Field identification & locations

The olive color, dark patches, and smooth polish are consistent with serpentine, but visual identification alone is uncertain. Common sources include California, Vermont, Italy, and New Zealand.