metamorphic
Tumbled serpentine
Serpentinite; chiefly antigorite, lizardite, and chrysotile, with magnetite and accessory minerals
AI-generated identification · may be incorrectTypically olive-green to yellow-green, mottled, waxy to greasy luster, and opaque; Mohs hardness is about 2.5–4. It has a fine-grained massive structure with no obvious cleavage and moderate density (about 2.5–2.6).
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Physical properties
Typically olive-green to yellow-green, mottled, waxy to greasy luster, and opaque; Mohs hardness is about 2.5–4. It has a fine-grained massive structure with no obvious cleavage and moderate density (about 2.5–2.6).
Formation & geological history
Forms when magnesium-rich ultramafic rocks such as peridotite are hydrated during metamorphism, commonly along tectonic plate boundaries; ages range from Precambrian to modern tectonic settings.
Uses & applications
Used as a decorative stone, carving material, tumbled stone, and occasionally as dimension stone; attractive pieces are collected but are generally low-value.
Geological facts
The yellow-green color and dark veining are characteristic of serpentine-group minerals; some varieties may contain asbestos-form chrysotile, so avoid cutting, sanding, or generating dust.
Field identification & locations
Identify it by its green mottling, relatively low hardness, waxy feel, and occasional black magnetite specks; common localities include California, Italy, Canada, New Zealand, and the Ural Mountains.
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