metamorphic

Serpentine

Antigorite/Chrysotile/Lizardite mix - Mg3Si2O5(OH)4

AI-generated identification · may be incorrect

Hardness: 3-6 (Mohs scale), Color: shades of greenish-yellow to dark green with brown iron staining, Luster: waxy to greasy, Crystal structure: monoclinic, Cleavage: poor/conchoidal fracture

Identified July 18, 2026More metamorphic →

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Physical properties

Hardness: 3-6 (Mohs scale), Color: shades of greenish-yellow to dark green with brown iron staining, Luster: waxy to greasy, Crystal structure: monoclinic, Cleavage: poor/conchoidal fracture

Formation & geological history

Formed through the hydrothermal alteration of ultramafic rocks like peridotite and pyroxenite, often at tectonic plate boundaries (serpentinization).

Uses & applications

Source of magnesium, decorative carvings, architectural stone, and historically for fire-resistant textiles (asbestos varieties).

Geological facts

California designated serpentine as its official state rock in 1965. It is actually a group of minerals rather than a single species.

Field identification & locations

Look for a distinctive greasy luster and greenish waxy appearance. Commonly found along fault zones and ophiolite complexes. Identifying feature is its softness (can often be scratched with a knife) and slippery feel.