metamorphic

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

AI-generated identification · may be incorrect

Hardness: 3-6 Mohs; Color: Olive green to blackish-green; Luster: Waxy, greasy, or silky; Texture: Smooth, sometimes fibrous or scaly; Cleavage: Poor

Hardness: 3-6 Mohs
Color: Olive green to blackish-green
Luster: Waxy, greasy, or silky

Identified July 17, 2026More metamorphic →

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Physical properties

Hardness: 3-6 Mohs; Color: Olive green to blackish-green; Luster: Waxy, greasy, or silky; Texture: Smooth, sometimes fibrous or scaly; Cleavage: Poor

Formation & geological history

Formed through the hydration and metamorphic transformation of ultramafic rocks from the Earth\'s mantle, such as peridotite, at tectonic plate boundaries.

Uses & applications

Used as a source of asbestos (historically), decorative building stone, carvings, jewelry, and for capturing carbon dioxide in carbon sequestration research.

Geological facts

Serpentinite is the official state rock of California. It often hosts rare plants that have adapted to its high magnesium and low calcium soil chemistry.

Field identification & locations

Identified by its distinctive green color, waxy feel, and common association with white veins of magnesite or chrysotile. Commonly found in ophiolite complexes.