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, and dull luster.
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Physical properties
Hardness of 6 on the Mohs scale, dark gray to black color, fine-grained aphanitic texture, and dull luster.
Formation & geological history
Formed from the rapid cooling of low-viscosity lava rich in magnesium and iron, typically at Earth's surface.
Uses & applications
Used widely in construction, aggregate for concrete, road base, and occasionally as dimension stone.
Geological facts
Basalt is the most common rock type in the Earth's crust underlying the world's ocean basins and forms major volcanic features like the Giant's Causeway.
Field identification & locations
Identify in the field by its dark color, heavy feel, and fine-grained texture; commonly found in riverbeds and beaches from volcanic regions.
