metamorphic
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
Hardness: 2.5-5 (Mohs), Color: shades of mottled green/black, Luster: waxy to greasy, Crystal structure: monoclinic (masses), Specific gravity: 2.5-2.6
- Hardness
- 2
Identified More metamorphic →
Explore Serpentinite in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 2.5-5 (Mohs), Color: shades of mottled green/black, Luster: waxy to greasy, Crystal structure: monoclinic (masses), Specific gravity: 2.5-2.6
Formation & geological history
Formed through the low-temperature hydrothermal metamorphic alteration of ultramafic rocks from the Earth's mantle, a process known as serpentinization, typically at tectonic plate boundaries.
Uses & applications
Used as decorative stone in interior architecture, source for magnesium and asbestos, and occasionally used in jewelry or as a base for carvings.
Geological facts
Serpentinite is the official state rock of California. When high-pressure metamorphic conditions occur, it can transform into rare jadeites.
Field identification & locations
Identify by its characteristic 'serpent-skin' mottled green appearance, waxy texture, and relative softness compared to quartz. Common in ophiolite complexes.
More like this
