metamorphic
Tumbled serpentine (likely green calcite or aventurine alternative)
Serpentine-group minerals, commonly antigorite/lizardite; approximate formula Mg₃Si₂O₅(OH)₄
AI-generated identification · may be incorrectPale yellow-green, opaque to slightly translucent, waxy/glassy luster, rounded from tumbling; hardness about 2.5–4 Mohs, with no visible cleavage and typically massive rather than crystalline. The photograph alone cannot distinguish serpentine confidently from green calcite, jade, or aventurine.
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Physical properties
Pale yellow-green, opaque to slightly translucent, waxy/glassy luster, rounded from tumbling; hardness about 2.5–4 Mohs, with no visible cleavage and typically massive rather than crystalline. The photograph alone cannot distinguish serpentine confidently from green calcite, jade, or aventurine.
Formation & geological history
Serpentine forms when ultramafic mantle rocks such as peridotite undergo hydration and metamorphism, commonly during ocean-floor alteration or tectonic subduction; ages vary from Precambrian to modern. It commonly occurs in serpentinite bodies and ophiolites.
Uses & applications
Used as ornamental stone, carvings, beads, and occasionally architectural stone; softer varieties are popular inexpensive tumbling material. It is not generally suitable for high-wear jewelry.
Geological facts
Serpentine is often mistaken for jade, but is substantially softer and commonly has a waxier surface. Some specimens may contain chrysotile asbestos, so avoid cutting or generating dust unless tested.
Field identification & locations
Common localities include California, Italy, New Zealand, Canada, and the Ural Mountains. Field clues include greasy/waxy green appearance, low hardness, and association with dark ultramafic rocks; hardness and acid tests help separate it from calcite and quartz.
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