metamorphic
Serpentine-rich metamorphic stone
Serpentinite, chiefly serpentine-group minerals (antigorite, lizardite, or chrysotile) with possible quartz, magnesite, and magnetite
AI-generated identification · may be incorrectTypically Mohs 2.5–4, waxy to greasy luster, pale green to dark green with white veining and mottled brown weathering; massive, fine-grained, and lacking visible cleavage. The rounded shape suggests tumbling or natural abrasion.
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Physical properties
Typically Mohs 2.5–4, waxy to greasy luster, pale green to dark green with white veining and mottled brown weathering; massive, fine-grained, and lacking visible cleavage. The rounded shape suggests tumbling or natural abrasion.
Formation & geological history
Forms when ultramafic mantle rocks such as peridotite hydrate during low-temperature metamorphism, commonly in ophiolites and subduction zones. Most examples are Mesozoic to younger, though serpentinite occurs in rocks of many ages.
Uses & applications
Used as decorative stone, carvings, countertops, and collector specimens; historically used for ornamental objects. Fibrous chrysotile-bearing material may present an asbestos hazard and should not be cut or abraded without proper controls.
Geological facts
The green color comes from serpentine minerals and iron; magnetite commonly causes dark specks and weak magnetism. Its waxy feel and tendency to form smooth rounded surfaces are useful clues.
Field identification & locations
Common in California, Italy, New Zealand, Canada, and ophiolite belts worldwide. Confirm with a hardness test, waxy luster, green streaking, and possible magnetism; visual identification alone is not definitive.
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