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 lava rich in iron and magnesium exposed at or near the Earth's surface.
Uses & applications
Used in construction, road aggregate, and landscaping.
Geological facts
Basalt is the most common rock type in the Earth's crust underlying the ocean basins.
Field identification & locations
Found worldwide in volcanic regions and riverbeds; identified by its dark, fine-grained appearance and heavy feel.
