metamorphic

Tumbled serpentine

Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; approximately Mg₃Si₂O₅(OH)₄

AI-generated identification · may be incorrect

Typically olive-green to gray-green, waxy to greasy luster, opaque, and smoothly polished; Mohs hardness 2.5–4, poor cleavage, fibrous or platy microscopic structure, and specific gravity about 2.5–2.6.

Identified September 21, 2026More metamorphic →

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Physical properties

Formation & geological history

Forms when magnesium-rich ultramafic rocks such as peridotite undergo hydrothermal alteration and hydration, commonly in ophiolites and subduction zones. Serpentinization ranges from Precambrian to modern geological settings.

Uses & applications

Used as an ornamental stone, carving material, beads, cabochons, and tumbled specimens; massive serpentine has also been used decoratively in architecture. Chrysotile-rich material should not be cut or abraded because its fibers can be hazardous when airborne.

Geological facts

The smooth elongated shape is human-made through tumbling and polishing. Its green color may resemble jade, but serpentine is softer and usually less dense.

Field identification & locations

Identify by its green-gray color, waxy luster, low hardness, and softness relative to jade; it may scratch with a steel knife. Common sources include California, New Zealand, Italy, Canada, and Afghanistan.