metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, e.g., Lizardite, Chrysotile, Antigorite)
Hardness: 3-6 (Mohs scale), Color: Dark forest green to mottled black/green, Luster: Waxy to greasy, Crystal Structure: Monoclinic, Cleavage: Poor, Specific Gravity: 2.5-2.6
Identified More metamorphic →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 3-6 (Mohs scale), Color: Dark forest green to mottled black/green, Luster: Waxy to greasy, Crystal Structure: Monoclinic, Cleavage: Poor, Specific Gravity: 2.5-2.6
Formation & geological history
Formed through the hydration of ultramafic rocks (like peridotite) from the Earth's mantle, typically at tectonic plate boundaries or subduction zones (hydrated hydrothermal metamorphism).
Uses & applications
Used as decorative architectural stone (Verde Antique), source of magnesium, historical asbestos source, and in carvings or ornamental jewelry.
Geological facts
Serpentinite is the official state rock of California. It can contain hazardous minerals like chrysotile (asbestos) in fibrous forms, though polished stones are generally safe for handling.
Field identification & locations
Identify by its characteristic 'serpent-like' green mottled appearance and waxy feel. Commonly found in ophiolite complexes, including California (USA), the Alps, and New Zealand.
More like this
