metamorphic

Serpentinite

Serpentinite, composed chiefly of serpentine-group minerals (e.g., antigorite, lizardite, chrysotile)

AI-generated identification · may be incorrect

Dark green to gray, mottled and veined, with a dull to waxy luster; typically Mohs 2.5–5.5, with no consistent cleavage. The image shows a weathered, rounded boulder with pale mineral veins and rusty patches.

Identified September 30, 2026More metamorphic →

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Physical properties

Formation & geological history

Forms when water alters ultramafic rocks such as peridotite, commonly along tectonic plate boundaries and ancient oceanic crust. Its age depends on the original rock and alteration event; these cannot be determined from the photograph.

Uses & applications

Used as decorative and building stone, landscaping rock, and occasionally carved or polished ornamental material. Chrysotile-bearing serpentinite may contain asbestos and should not be cut or ground without testing.

Geological facts

The pale veins may be carbonate or other alteration minerals, but their identity cannot be confirmed visually.

Field identification & locations

Often recognized by its green color, smooth or waxy surfaces, and veining; occurs in serpentinite belts worldwide. A hand specimen’s locality or simple mineral tests are needed for a reliable identification.