metamorphic
Tumbled green serpentine
Serpentine-group minerals, chiefly antigorite and/or lizardite; commonly marketed as “serpentine jade”
AI-generated identification · may be incorrectTypically dark to pale green with mottled or web-like black veining, waxy to vitreous luster, and rounded polished surfaces. Mohs hardness is about 2.5–4; massive and microcrystalline, with indistinct cleavage and specific gravity around 2.5–2.6.
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Physical properties
Typically dark to pale green with mottled or web-like black veining, waxy to vitreous luster, and rounded polished surfaces. Mohs hardness is about 2.5–4; massive and microcrystalline, with indistinct cleavage and specific gravity around 2.5–2.6.
Formation & geological history
Forms when ultramafic mantle rocks such as peridotite are hydrated and altered during tectonic activity, commonly in ophiolites and subduction-related settings. The specimen is a modern tumbled piece; its exact geological age cannot be determined visually.
Uses & applications
Used for carvings, beads, ornamental stone, cabochons, and decorative objects; softer varieties are sometimes sold as imitation jade. Not generally preferred for structural construction.
Geological facts
Serpentine is a mineral group rather than one single mineral, and its green color comes from iron and other trace elements. Some serpentinites may contain chrysotile asbestos, so avoid cutting or generating dust unless the material is tested.
Field identification & locations
Identify by its green mottling, waxy feel, low hardness, and inability to scratch glass; a steel knife may scratch it. Common sources include California, Italy, New Zealand, Canada, and Afghanistan.
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