metamorphic

Serpentinite (likely serpentine-rich rock)

Serpentinite; chiefly serpentine-group minerals, Mg3Si2O5(OH)4

AI-generated identification · may be incorrect

Typically olive to green-gray, waxy to dull luster, fine-grained and massive; Mohs hardness about 2.5–4, with poor cleavage and commonly a smooth, slick feel. The specimen’s color and texture are consistent with serpentine, though an image alone cannot confirm composition.

Identified September 16, 2026More metamorphic →

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Physical properties

Formation & geological history

Forms when ultramafic mantle rocks such as peridotite are hydrated and metamorphosed, commonly along tectonic plate boundaries and ancient oceanic crust. Formation ages vary widely, from modern seafloor alteration to Precambrian occurrences.

Uses & applications

Used as decorative and carving stone, ornamental aggregate, and historically as a source of asbestos-bearing minerals; jewelry-grade varieties are occasionally polished. Fibrous asbestos forms should not be cut or powdered.

Geological facts

Often shows mottled green, vein-like textures and may resemble jade, but is generally softer. Some serpentinite contains magnetite and can be weakly magnetic.

Field identification & locations

Common in ophiolite belts and mountain ranges, including California, Italy, New Zealand, and Canada; test for a waxy feel, relatively low hardness, and green streak, but avoid destructive testing if asbestos is suspected.