metamorphic
Green-and-white mottled stone, possibly serpentinite
Likely serpentinized ultramafic rock; exact identification is uncertain from the photograph
AI-generated identification · may be incorrectOpaque, mottled dark green and cream, with a dull to slightly waxy surface and irregular shape. Serpentinite commonly has hardness around 3–6 Mohs and consists mainly of serpentine minerals, sometimes with calcite or other minerals.
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Physical properties
Opaque, mottled dark green and cream, with a dull to slightly waxy surface and irregular shape. Serpentinite commonly has hardness around 3–6 Mohs and consists mainly of serpentine minerals, sometimes with calcite or other minerals.
Formation & geological history
Serpentinite forms when water alters magnesium-rich mantle rocks, commonly during tectonic activity; its age depends on the source deposit.
Uses & applications
Small pieces are collected or used for decorative carvings and lapidary work; larger serpentinite deposits may be used as ornamental stone.
Geological facts
The green color and patchy pale areas are consistent with serpentinite, but similar-looking rocks include jade-like stones and altered volcanic rocks.
Field identification & locations
A firm identification requires tests or a clearer view: inspect hardness, streak, translucency, and texture; avoid relying on color alone. Serpentinite occurs in many regions, especially along ancient plate boundaries.
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