metamorphic
Serpentine
Antigorite, Lizardite, or Chrysotile; (Mg, Fe)3Si2O5(OH)4
Hardness: 3–6 (Mohs scale), Color: lime green to olive green, Luster: waxy to greasy, Crystal structure: Monoclinic, Cleavage: poor/basal, Specific Gravity: 2.2–2.9
Identified More metamorphic →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 3–6 (Mohs scale), Color: lime green to olive green, Luster: waxy to greasy, Crystal structure: Monoclinic, Cleavage: poor/basal, Specific Gravity: 2.2–2.9
Formation & geological history
Formed through the hydrothermal alteration of ultramafic rocks (serpentinization) in the Earth's mantle and at convergent plate boundaries, usually during the Paleozoic to Cenozoic eras.
Uses & applications
Commonly used for ornamental carvings, jewelry, architectural facades, and historically as a source of asbestos.
Geological facts
Serpentine is the official state rock of California. It often creates 'serpentine barrens,' which are areas with unique soil chemistry that supports rare plant life.
Field identification & locations
Identify in the field by its distinctive green color, soapy or waxy feel, and its association with fault zones and tectonic plate boundaries. It is softer than many other green minerals like jade.
More like this
