metamorphic
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
Hardness: 3-6 Mohs; Color: Dark green to black, often mottled or waxy; Luster: Greasy, waxy, or silky; Structure: Massive to fibrous; Specific Gravity: 2.5-2.6
- Hardness
- 3-6 Mohs
- Color
- Dark green to black, often mottled or waxy
- Luster
- Greasy, waxy, or silky
Identified More metamorphic →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 3-6 Mohs; Color: Dark green to black, often mottled or waxy; Luster: Greasy, waxy, or silky; Structure: Massive to fibrous; Specific Gravity: 2.5-2.6
Formation & geological history
Formed through the hydrothermal alteration of ultramafic rocks (peridotite/pyroxenite) from the Earth's mantle, typically at tectonic plate boundaries (subduction zones).
Uses & applications
Used as an architectural ornamental stone (verde antique), source for magnesium, and historically as a source of asbestos. Used in carvings and jewelry.
Geological facts
Serpentinite is the official state rock of California. It is often called 'serpentine,' though serpentine is technically the name of the mineral group it contains.
Field identification & locations
Identify by its characteristic 'snake-skin' appearance, greasy feel, and green color. Common in ophiolite complexes and mountain ranges like the Alps or the California Coast Ranges.
More like this
