metamorphic
Serpentine (often sold as “new jade”), polished egg
Serpentinite, composed chiefly of serpentine-group minerals (approx. Mg₃Si₂O₅(OH)₄); dark patches may be magnetite or other accessory minerals
AI-generated identification · may be incorrectPolished, yellow-green with dark mottling and a vitreous-to-waxy luster. Serpentine minerals have Mohs hardness about 2.5–5.5 and monoclinic or orthorhombic structures; this egg’s exact composition cannot be confirmed from appearance alone.
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Physical properties
Polished, yellow-green with dark mottling and a vitreous-to-waxy luster. Serpentine minerals have Mohs hardness about 2.5–5.5 and monoclinic or orthorhombic structures; this egg’s exact composition cannot be confirmed from appearance alone.
Formation & geological history
Forms when magnesium-rich ultramafic rocks are altered by water, commonly along oceanic crust and tectonic plate boundaries. The age depends on the source deposit; serpentinization can occur at various times in Earth’s history.
Uses & applications
Carved ornaments and collectibles; some serpentine is used as decorative stone. This small polished egg is primarily ornamental.
Geological facts
“New jade” is a trade name and does not mean the material is jadeite or nephrite.
Field identification & locations
Serpentine is commonly found in serpentinite belts worldwide, including Italy, Canada, China, and the United States. A gemological test is needed to distinguish it reliably from other green stones; the photo is insufficient to verify the material.
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