igneous
Basalt Pebble
Extrusive Igneous Rock
AI-generated identification · may be incorrectHardness of 6 on the Mohs scale, dark gray to black color, aphanitic texture with fine-grained crystals, and dull luster.
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Physical properties
Hardness of 6 on the Mohs scale, dark gray to black color, aphanitic texture with fine-grained crystals, and 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
Used in construction, aggregate for concrete, road base, and occasionally in stone carving or landscaping.
Geological facts
Basalt is the most common rock type in the Earth's crustal portions underlying the ocean basins and forms much of the moon's maria.
Field identification & locations
Identified by its dark color, heavy weight relative to size, and fine-grained matrix; commonly found in riverbeds and beaches worldwide.
