metamorphic

Weathered serpentine or serpentinite

Serpentine-group minerals, chiefly antigorite, lizardite, and chrysotile; commonly Mg₃Si₂O₅(OH)₄

AI-generated identification · may be incorrect

Soft (Mohs 2.5–4), pale green to yellow-green with pink-brown iron-oxide staining, waxy to dull luster, and massive rather than visible crystal structure; cleavage is poor to absent. The specimen’s rough, mottled appearance is consistent with heavily weathered serpentine, though a photo cannot confirm the identificatio…

Identified September 6, 2026More metamorphic →

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Physical properties

Formation & geological history

Forms when magnesium-rich ultramafic rocks such as peridotite undergo hydration during metamorphism, commonly in oceanic crust and subduction-zone mélanges. Formation ages vary widely, from Precambrian to modern tectonic settings.

Uses & applications

Used as decorative stone, carvings, countertops, and historically for ornamental objects; some varieties are collected as lapidary material. Chrysotile-rich material may contain hazardous asbestos fibers and should not be cut or powdered.

Geological facts

Its green color commonly results from serpentine minerals, while yellow, red, and brown tones reflect oxidation of iron-bearing minerals. Serpentinite is also an important indicator of ancient oceanic crust and mantle rocks.

Field identification & locations

Often identified by low hardness, waxy feel, green color, and a tendency to scratch with a steel knife; acid generally produces little reaction. Common in California, Italy, New Zealand, Canada, and tectonic mountain belts worldwide.