metamorphic
Tumbled serpentine
Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile)
AI-generated identification · may be incorrectTypically olive-green to gray with mottled or veined patterns and a waxy to greasy luster; Mohs hardness 2.5–4, massive rather than visibly crystalline, with poor or indistinct cleavage. The smooth rounded surface indicates tumbling and polishing.
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Physical properties
Typically olive-green to gray with mottled or veined patterns and a waxy to greasy luster; Mohs hardness 2.5–4, massive rather than visibly crystalline, with poor or indistinct cleavage. The smooth rounded surface indicates tumbling and polishing.
Formation & geological history
Forms when ultramafic mantle rocks, especially peridotite, undergo hydrothermal alteration and hydration; commonly associated with subduction zones and ophiolites, ranging from ancient to modern geological settings.
Uses & applications
Used as ornamental stone, carvings, cabochons, beads, and tumbled specimens; historically used for architectural facing, though chrysotile-bearing material requires caution because asbestos fibers may be hazardous when airborne.
Geological facts
The green color reflects iron-bearing serpentine minerals and can resemble jade, but serpentine is generally softer and less dense. Identification is approximate from the photograph because several green metamorphic rocks can look similar when polished.
Field identification & locations
Common in California, New Zealand, Italy, Canada, and serpentinite belts worldwide; field clues include green mottling, waxy feel, low hardness, and association with dark ultramafic rocks. A hardness test and mineralogical analysis can confirm it.
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