metamorphic
Tumbled serpentine
Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; approximately Mg₃Si₂O₅(OH)₄
AI-generated identification · may be incorrectTypically 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 More metamorphic →
Explore Tumbled serpentine in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
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.
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.
More like this
