metamorphic
Tumbled green-and-white stone, likely serpentine or chlorite-rich metamorphic rock
Serpentinite (antigorite/lizardite), possibly chlorite- or quartz-bearing
AI-generated identification · may be incorrectPolished, mottled dark green, gray, and white; typically Mohs 3–5.5, waxy to vitreous luster, massive texture, and no obvious cleavage; density about 2.5–2.7 g/cm³.
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Physical properties
Polished, mottled dark green, gray, and white; typically Mohs 3–5.5, waxy to vitreous luster, massive texture, and no obvious cleavage; density about 2.5–2.7 g/cm³.
Formation & geological history
Forms when ultramafic mantle rocks hydrothermally alter, commonly along tectonic plate boundaries; ages range from Precambrian to modern oceanic settings. The specimen has been shaped and polished by tumbling.
Uses & applications
Used as an ornamental stone, carving material, cabochons, and decorative objects; attractive pieces have modest lapidary value.
Geological facts
Serpentinite commonly contains antigorite, lizardite, or chrysotile; asbestos fibers may occur in some varieties, though a polished tumbled piece presents little exposure risk.
Field identification & locations
Identify by its green mottling, relatively low hardness, waxy polish, and resistance to dilute acid; common in ophiolites and metamorphic belts worldwide, including California, Italy, New Zealand, and Canada.
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