metamorphic

Serpentinite (probable)

Serpentinite; chiefly serpentine-group minerals, Mg3Si2O5(OH)4, with possible magnetite, chromite, and carbonate

AI-generated identification · may be incorrect

Green to black mottled, waxy-to-dull luster, fine-grained and massive; Mohs hardness about 2.5–4, commonly low specific gravity, with no obvious cleavage. The specimen appears rough and partly weathered, so exact identification requires testing.

Identified September 20, 2026More metamorphic →

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Physical properties

Formation & geological history

Forms when ultramafic mantle rocks such as peridotite undergo hydration and low-temperature metamorphism, commonly in ophiolites and subduction zones. Formation ages vary widely depending on the tectonic setting.

Uses & applications

Used as decorative or architectural stone, carved objects, and a collector specimen; historically called “verde antique” when attractive and polishable. Avoid cutting or generating dust until asbestos-form minerals are excluded.

Geological facts

Its green color and veined, mottled appearance are characteristic, but similar rocks include chlorite schist, altered basalt, and greenstone. Some serpentinite contains fibrous chrysotile or other asbestos minerals.

Field identification & locations

Common in California, the Appalachians, the Alps, New Zealand, and oceanic suture zones. Field clues include a greasy/waxy feel, green-black patterning, unusually soft surfaces, and possible magnetism; a streak, hardness, and professional mineralogical test can confirm it.