igneous
Gabbro
Coarse-grained mafic intrusive igneous rock
AI-generated identification · may be incorrectHardness of 6 on the Mohs scale. Colors range from dark gray to black, with a sub-metallic or dull luster and a phaneritic crystal structure.
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Physical properties
Hardness of 6 on the Mohs scale. Colors range from dark gray to black, with a sub-metallic or dull luster and a phaneritic crystal structure.
Formation & geological history
Formed by the slow cooling of magnesium- and iron-rich magma beneath the Earth's surface.
Uses & applications
Used widely in construction as crushed stone, dimension stone, and for kitchen countertops.
Geological facts
Gabbro is the intrusive equivalent of basalt and makes up a significant portion of Earth's oceanic crust.
Field identification & locations
Identify in the field by its dark color and visible interlocking crystals of plagioclase feldspar and pyroxene. Found globally in layered intrusions and ophiolites.
