metamorphic
Serpentine (Green Jasper variety)
Antigorite/Chrysotile, Mg3Si2O5(OH)4
Hardness: 3-5 (Mohs scale), Color: Mottled olive green with black veins, Luster: Waxy to greasy, Structure: Microcrystalline, Cleavage: Poor, Specific Gravity: 2.5-2.6
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Physical properties
Hardness: 3-5 (Mohs scale), Color: Mottled olive green with black veins, Luster: Waxy to greasy, Structure: Microcrystalline, Cleavage: Poor, Specific Gravity: 2.5-2.6
Formation & geological history
Formed through the hydration of ultramafic rocks (peridotite) from the Earth's mantle at relatively low temperatures and high pressures, a process known as serpentinization.
Uses & applications
Commonly used for ornamental carvings, spiritual/metaphysical stones, decorative tiles, and polished cabochons for jewelry.
Geological facts
Serpentine is the state rock of California. It is often confused with jade but is much softer. Some fibrous varieties contain asbestos.
Field identification & locations
Identify in the field by its characteristic waxy 'snakeskin' look and green-to-black mottling. Found in ophiolite belts like those in the Alps, New Zealand, and California.
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