metamorphic
Polished serpentine (likely)
Serpentine-group minerals, chiefly antigorite and lizardite; commonly derived from altered peridotite
AI-generated identification · may be incorrectPale yellow-green, mottled and waxy to greasy luster, with dark veins and fine massive texture; Mohs hardness about 2.5–4, no visible cleavage, and specific gravity roughly 2.5–2.6. The rounded shape indicates tumbling or polishing.
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Physical properties
Pale yellow-green, mottled and waxy to greasy luster, with dark veins and fine massive texture; Mohs hardness about 2.5–4, no visible cleavage, and specific gravity roughly 2.5–2.6. The rounded shape indicates tumbling or polishing.
Formation & geological history
Forms when mantle-derived ultramafic rocks undergo hydration and hydrothermal metamorphism, generally in ancient ophiolite belts and subduction zones; exact age cannot be determined from the image.
Uses & applications
Used for carvings, ornamental stone, beads, and low-cost cabochons; massive serpentine has also been used decoratively as “serpentine marble.” Avoid dust or powders because some serpentines may contain asbestos-form minerals.
Geological facts
Its mottled green-yellow appearance commonly resembles jade, but serpentine is softer and typically less dense. The specimen could also be a related greenstone such as altered soapstone, so laboratory testing would be needed for certainty.
Field identification & locations
Look for a smooth waxy surface, low hardness, green-yellow mottling, and dark veining; it can often be scratched by a steel nail. Common sources include California, Italy, New Zealand, Canada, Russia, and Afghanistan.
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