igneous
Basalt
Extrusive Igneous Rock
AI-generated identification · may be incorrectHardness of 6 on Mohs scale, typically dark gray to black, aphanitic (fine-grained) texture, dull luster.
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Physical properties
Hardness of 6 on Mohs scale, typically dark gray to black, aphanitic (fine-grained) texture, dull luster.
Formation & geological history
Formed from the rapid cooling of low-viscosity basaltic lava exposed at or very near the Earth's surface.
Uses & applications
Widely used in construction for road base, concrete aggregate, and dimension stone.
Geological facts
Basalt is the most common rock type in the Earth's crustal portions underlying the ocean basins.
Field identification & locations
Identify by its dark, fine-grained appearance; commonly found in volcanic regions and oceanic crusts worldwide.
