metamorphic
Banded Serpentine
Serpentine group (subgroup Lizardite or Antigorite) - Mg3Si2O5(OH)4
Hardness: 3-6 (Mohs scale), Color: shades of light and dark green, Luster: waxy to greasy, Crystal structure: monoclinic, Cleavage: poor/basal, Specific gravity: 2.5-2.6
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Physical properties
Hardness: 3-6 (Mohs scale), Color: shades of light and dark green, Luster: waxy to greasy, Crystal structure: monoclinic, Cleavage: poor/basal, Specific gravity: 2.5-2.6
Formation & geological history
Formed through serpentinization, which is the hydration of ultramafic rocks (like peridotite) from the Earth’s mantle at low temperatures and high pressures.
Uses & applications
Used for architectural carvings, decorative gemstones, jewelry such as beads and cabochons, and as a source of magnesium.
Geological facts
Serpentine is the official state rock of California. The banding in this specimen is often caused by alternating layers of different serpentine minerals or different trace mineral inclusions.
Field identification & locations
Identify by its characteristic waxy 'snake-skin' appearance and soapy feel. It is commonly found in ophiolite complexes and metamorphic belts, particularly in mountains.
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