metamorphic

Tumbled serpentine

Serpentinite; chiefly antigorite, lizardite, and/or chrysotile [Mg₃Si₂O₅(OH)₄]

AI-generated identification · may be incorrect

Dark olive-green, opaque, waxy to vitreous polished luster with pale veining; Mohs hardness about 2.5–4, typically massive and non-cleavable at hand-specimen scale. The rounded, glossy form is tumbled and polished.

Identified August 11, 2026More metamorphic →

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Physical properties

Formation & geological history

Forms when ultramafic mantle rocks such as peridotite hydrate during low-temperature metamorphism, commonly in oceanic crust and tectonic mélanges. Most specimens are ancient Paleozoic–Mesozoic or younger tectonic rocks, though age cannot be determined visually.

Uses & applications

Used as decorative stone, carvings, cabochons, beads, and small polished specimens; massive serpentinite has also been used architecturally. Chrysotile-bearing material should not be cut, drilled, or powdered because asbestos fibers may be hazardous.

Geological facts

The green color comes mainly from iron-bearing serpentine minerals; contrasting veins may contain magnesite, calcite, or other alteration minerals. It can resemble jade, but is generally softer and less tough.

Field identification & locations

Identify by its olive-green mottled appearance, waxy polish, low hardness, and often pale vein network; a steel knife commonly scratches it, unlike jade. Common in alpine and ophiolite belts, including California, Italy, New Zealand, and Canada.