metamorphic
Polished serpentine with veined host rock
Serpentine-group minerals, chiefly antigorite/lizardite (Mg₃Si₂O₅(OH)₄)
AI-generated identification · may be incorrectThe specimen shows a pale yellow-green, waxy to slightly vitreous polished surface with contrasting white-gray veining. Serpentine has Mohs hardness 2.5–4, typically massive rather than visibly crystalline, and relatively low specific gravity (~2.5–2.6).
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Physical properties
The specimen shows a pale yellow-green, waxy to slightly vitreous polished surface with contrasting white-gray veining. Serpentine has Mohs hardness 2.5–4, typically massive rather than visibly crystalline, and relatively low specific gravity (~2.5–2.6).
Formation & geological history
Formed when ultramafic rocks such as peridotite undergo hydration and metamorphism, commonly in oceanic crust and subduction zones. Serpentinization ranges from Precambrian to modern geological settings.
Uses & applications
Used as an ornamental and carving stone, decorative polished material, and historically as a source of asbestos-group minerals; it is generally unsuitable for everyday jewelry because of softness.
Geological facts
The yellow-green color is characteristic of serpentine, though similar colors may occur in chrysoprase, jade, or soapstone. Fibrous varieties may contain regulated carcinogenic chrysotile asbestos.
Field identification & locations
Common localities include California, Vermont, Italy, New Zealand, and the Ural Mountains. Field clues are greasy or waxy luster, softness, green streaks, and association with dark ultramafic rock; avoid sanding or breaking unknown fibrous material.
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