mineral

Tumbled serpentine (likely)

Serpentine-group minerals, commonly antigorite or lizardite; approximate formula Mg₃Si₂O₅(OH)₄

AI-generated identification · may be incorrect

Pale olive-green, opaque, waxy to dull luster, smooth tumbled surface; Mohs hardness about 2.5–4, with no obvious cleavage. The rounded shape and uniform green color are consistent with a polished/tumbled specimen, though visual identification is not definitive.

Identified August 12, 2026More mineral →

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Physical properties

Formation & geological history

Forms when ultramafic mantle rocks such as peridotite undergo hydrothermal alteration and hydration, typically in oceanic crust and subduction-related settings. Serpentinization occurs across geologic time rather than representing one specific age.

Uses & applications

Used decoratively for carvings, beads, cabochons, and ornamental stone; some varieties are sold as “new jade.” Common pieces generally have modest value.

Geological facts

Serpentine is a mineral group rather than one single mineral, and its green color comes mainly from iron and nickel impurities. It can resemble jade, but is usually softer and less dense.

Field identification & locations

Common in serpentinite terrains, including California, Italy, New Zealand, and the Appalachians. A glassy or waxy green surface, low hardness, and relatively light weight help distinguish it from jade; laboratory testing may be needed.