metamorphic
Polished green stone, likely serpentine
Serpentine-group minerals, commonly antigorite or lizardite: Mg₃Si₂O₅(OH)₄
AI-generated identification · may be incorrectPale green with darker veining and a waxy-to-glassy polish; typically Mohs hardness 2.5–4, nonmetallic luster, and massive rather than visibly crystalline structure. The elongated shape appears cut or tumbled, and the bright pale band may be quartz, calcite, or surface reflection.
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Physical properties
Pale green with darker veining and a waxy-to-glassy polish; typically Mohs hardness 2.5–4, nonmetallic luster, and massive rather than visibly crystalline structure. The elongated shape appears cut or tumbled, and the bright pale band may be quartz, calcite, or surface reflection.
Formation & geological history
Serpentine forms when ultramafic mantle rocks such as peridotite hydrate during hydrothermal alteration, commonly in ophiolites and subduction-related settings. Formation ages range from Precambrian to modern geological activity.
Uses & applications
Used as ornamental stone, carvings, cabochons, beads, and architectural facing; historically marketed as “new jade.” Avoid inhaling dust because some serpentine rocks may contain asbestos-form minerals.
Geological facts
The image is too small and blurred for a definitive identification; nephrite jade, green fluorite, or dyed stone are alternatives. Serpentine commonly shows mottled green coloration and a smooth, soapy feel.
Field identification & locations
Check hardness, streak, translucency, and density; serpentine is usually softer than quartz and can be scratched by a steel blade. Common localities include California, Vermont, Italy, Canada, New Zealand, and Afghanistan.
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