metamorphic

Polished serpentine

Serpentinite; chiefly antigorite, lizardite, and chrysotile serpentine minerals

AI-generated identification · may be incorrect

Dark olive-green to black, waxy-to-glassy luster, smooth polished surface, commonly veined; Mohs hardness about 2.5–4, massive rather than visibly crystalline, with poor cleavage and specific gravity around 2.5–2.6.

Identified September 21, 2026More metamorphic →

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Physical properties

Formation & geological history

Forms when ultramafic mantle rocks such as peridotite hydrate during metamorphism, commonly along plate boundaries and subduction zones. Most examples are Paleozoic to Mesozoic or younger, depending on the tectonic setting.

Uses & applications

Used for ornamental stone, carvings, cabochons, beads, and tumbled specimens; massive serpentinite has also been used as decorative building stone. Chrysotile-rich material may contain asbestos and should not be cut or abraded without testing and precautions.

Geological facts

The elongated dark body and lighter vein are typical of polished serpentinite. It can resemble jade, but it is generally softer and less durable; the specimen may also include magnetite or remnants of the original peridotite.

Field identification & locations

Identify by its greasy/waxy feel, green-black color, low hardness, and commonly fibrous or vein-like pattern; it often occurs in ophiolites and metamorphic belts. Common sources include California, Italy, New Zealand, Canada, and Pakistan.