metamorphic
Serpentinite (with Pyrite/Garnet inclusions)
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3Si2O5(OH)4
Hardness: 2.5-5 (Mohs scale); Color: dark green to black with white veining and bronze metallic inclusions; Luster: waxy to greasy; Crystal Structure: Monoclinic; Cleavage: poor/basal; Specific Gravity: 2.5-2.6
- Hardness
- 2
- Luster
- waxy to greasy
Identified More metamorphic →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 2.5-5 (Mohs scale); Color: dark green to black with white veining and bronze metallic inclusions; Luster: waxy to greasy; Crystal Structure: Monoclinic; Cleavage: poor/basal; Specific Gravity: 2.5-2.6
Formation & geological history
Formed through the hydration and metamorphic transformation of ultramafic rocks from the Earth's mantle, typically in subduction zones or mid-ocean ridges. This specimen shows hydrothermal alteration with metallic sulfide mineralization.
Uses & applications
Used historically as decorative stone, for building facades, and as a source of asbestos or magnesium. It is common in geological collections.
Geological facts
Serpentinite is the state rock of California. It often forms in the roots of mountains during tectonic plate collisions and is closely associated with oceanic crust being pushed onto continents.
Field identification & locations
Identify in the field by its characteristic 'serpent-like' green mottled color and waxy feel. It is commonly found in the Coast Ranges of California, the Alps, and the Appalachians. Look for the localized metallic sheen of pyrite or chalcopyrite.
More like this
