metamorphic
Serpentine
Antigorite/Lizardite (Mg, Fe)3Si2O5(OH)4
Hardness: 3-6 (Mohs); Color: Pale to dark green, waxy or greasy luster, massive or fibrous crystal structure, specific gravity 2.2-2.9
- Hardness
- 3-6 (Mohs)
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Physical properties
Hardness: 3-6 (Mohs); Color: Pale to dark green, waxy or greasy luster, massive or fibrous crystal structure, specific gravity 2.2-2.9
Formation & geological history
Formed through the hydro-thermal alteration (serpentinization) of mafic and ultramafic rocks like peridotite in low temperature, high pressure metamorphic environments.
Uses & applications
Used as an ornamental stone for carvings, architectural veneer, or as a source of asbestos in specific varieties. Also used for magnesium extraction.
Geological facts
Serpentine is the name for a group of minerals; it is the state rock of California and is often associated with tectonic plate boundaries.
Field identification & locations
Identified by its soapy or greasy feel, characteristic green color, and relative softness. Common in mountain ranges and near subduction zones.
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