igneous
Basalt Pebble
Extrusive Igneous Rock
AI-generated identification · may be incorrectHardness of 6 on the Mohs scale, dark gray to black color, fine-grained aphanitic texture, dull luster.
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Physical properties
Hardness of 6 on the Mohs scale, dark gray to black color, fine-grained aphanitic texture, dull luster.
Formation & geological history
Formed from the rapid cooling of low-viscosity, mafic lava flows at the Earth's surface.
Uses & applications
Used in aggregate for construction, railroad ballast, and decorative landscaping.
Geological facts
Basalt is the most common rock type in the Earth's crust underlying the ocean basins and forming volcanic islands.
Field identification & locations
Identified by its dark color, heavy weight, and fine-grained matrix; commonly found in riverbeds and beaches.
