metamorphic
Banded Serpentinite with Calcite Veins
Serpentinite (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
Hardness: 3-6 (Mohs scale), Color: Dark green to black with white banding, Luster: Waxy to greasy, Structure: Microcrystalline, Cleavage: Poor
- Luster
- Waxy to greasy, Structure: Microcrystalline, Cleavage: Poor
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Physical properties
Hardness: 3-6 (Mohs scale), Color: Dark green to black with white banding, Luster: Waxy to greasy, Structure: Microcrystalline, Cleavage: Poor
Formation & geological history
Formed through 'serpentinization,' a low-temperature metamorphic process where ultramafic rocks from the Earth's mantle are hydrated. The white veins are likely calcite or quartz filling fractures created during tectonic activity. Common in the French Alps (Vercors/Drôme region).
Uses & applications
Used primarily as decorative stone, for carvings, and occasionally as industrial source for magnesium.
Geological facts
This specimen is highly characteristic of the Alpine Ophiolites. Serpentinite is often called 'the Green Stone of the Alps.'
Field identification & locations
Look for the waxy luster and soapy feel. It is commonly found in riverbeds in the southeastern France region as water-worn pebbles.
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