igneous
Peridotite
Ultramafic igneous rock
AI-generated identification · may be incorrectHardness 6-7 on Mohs scale, dark greenish color, vitreous to dull luster, granular crystal structure, specific gravity around 3.3-3.32.
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Physical properties
Hardness 6-7 on Mohs scale, dark greenish color, vitreous to dull luster, granular crystal structure, specific gravity around 3.3-3.32.
Formation & geological history
Formed from the crystallization of magma rich in magnesium and iron deep within the Earth's upper mantle.
Uses & applications
Used as a source of chromium and platinum, and can alter to serpentine or host peridot gemstones.
Geological facts
Peridotite is the dominant rock type of the Earth's upper mantle and rarely reaches the surface except through tectonic obduction.
Field identification & locations
Identify by its dense, dark green appearance and abundant olivine content; commonly found in ophiolite complexes.
