metamorphic
Tumbled serpentine
Serpentinite; chiefly antigorite, lizardite, and chrysotile, with possible magnetite and accessory minerals
AI-generated identification · may be incorrectTypically dark green to gray-green with mottled or veined patterns and a waxy to greasy luster; Mohs hardness about 2.5–4, fine-grained, and commonly massive rather than visibly crystalline. The polished, rounded form indicates a tumbled specimen.
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Physical properties
Typically dark green to gray-green with mottled or veined patterns and a waxy to greasy luster; Mohs hardness about 2.5–4, fine-grained, and commonly massive rather than visibly crystalline. The polished, rounded form indicates a tumbled specimen.
Formation & geological history
Forms when ultramafic mantle rocks such as peridotite are hydrated and metamorphosed, commonly along oceanic crust and plate-boundary fault zones. Serpentinization occurs from low to moderate temperatures, often spanning much of geological time.
Uses & applications
Used as ornamental stone, carvings, cabochons, and polished healing-stone specimens; massive serpentinite has also been used historically for architecture and countertops, though asbestos-bearing varieties require care.
Geological facts
Its green color comes from hydrated magnesium silicate minerals, while black flecks may be magnetite or chromite. Some serpentinite contains fibrous chrysotile asbestos, so avoid cutting or creating dust unless its composition is verified.
Field identification & locations
Identify by its mottled green-black color, waxy polish, low hardness, and occasional dark magnetic flecks; common sources include California, Vermont, Italy, New Zealand, and the Himalayas. Image-based identification is approximate and could overlap with nephrite or other green stones.
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