metamorphic
Polished serpentine-rich stone (likely bowenite or serpentine jasper)
Serpentine-group minerals, chiefly antigorite/lizardite; possibly mixed with talc, magnetite, and iron oxides
AI-generated identification · may be incorrectGreen-gray, mottled and reddish-brown from iron staining, with a waxy to dull luster and smooth tumbled surface. Serpentine has Mohs hardness about 2.5–4, poor cleavage, fine-grained massive texture, and specific gravity around 2.5–2.6.
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Physical properties
Green-gray, mottled and reddish-brown from iron staining, with a waxy to dull luster and smooth tumbled surface. Serpentine has Mohs hardness about 2.5–4, poor cleavage, fine-grained massive texture, and specific gravity around 2.5–2.6.
Formation & geological history
Formed when ultramafic mantle rocks such as peridotite undergo low-temperature hydrothermal alteration (serpentinization), commonly during oceanic crust formation or tectonic uplift. The specimen is polished, so its precise age and locality cannot be determined visually.
Uses & applications
Used as ornamental stone, carvings, cabochons, beads, and decorative tiles; historically used as a jade substitute when fine-grained and translucent. Common tumbled pieces generally have modest value.
Geological facts
The mottled green color and waxy appearance are characteristic of serpentine, while red patches usually reflect oxidized iron minerals. Some serpentine rocks may contain chrysotile asbestos; avoid cutting or generating dust unless composition is confirmed.
Field identification & locations
Common in ultramafic terrains, including California, Italy, New Zealand, Canada, and the Ural Mountains. Field identification relies on green waxy texture, low hardness, lightweight feel, and association with peridotite; this polished specimen could also be serpentine-bearing jasper.
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