metamorphic
Polished serpentine-rich stone (likely serpentine jasper or “rainforest jasper”)
Serpentine-group minerals, chiefly antigorite/lizardite, with iron oxides and silica-rich rock matrix
AI-generated identification · may be incorrectGreen, brown, orange, and cream mottling with a polished waxy-to-glassy luster; typically Mohs 2.5–5.5, opaque, fine-grained, and lacking visible cleavage. The exact identification is uncertain from the image alone; it may also be a jasper-serpentine lapidary composite.
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Physical properties
Green, brown, orange, and cream mottling with a polished waxy-to-glassy luster; typically Mohs 2.5–5.5, opaque, fine-grained, and lacking visible cleavage. The exact identification is uncertain from the image alone; it may also be a jasper-serpentine lapidary composite.
Formation & geological history
Serpentine forms when ultramafic mantle rocks such as peridotite hydrate during metamorphism, commonly in ancient oceanic crust and subduction zones; associated jasper-like material forms from silica-rich fluids. Geological ages vary widely.
Uses & applications
Used as a decorative stone, cabochon, carving, and ornamental object; softer varieties are unsuitable for heavy construction. Avoid generating dust, since some serpentinites can contain asbestos-group minerals.
Geological facts
The vivid green coloration commonly reflects serpentine minerals, while rusty orange-brown areas usually indicate iron oxides. Polishing can strongly enhance the color pattern.
Field identification & locations
Common sources include California, Italy, New Zealand, Canada, and Afghanistan. Field clues are low density, waxy polish, green alteration colors, and softness relative to quartz; hardness and streak tests would help distinguish it from jasper.
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