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 to sub-metallic 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 to sub-metallic luster.
Formation & geological history
Formed from the rapid cooling of low-viscosity lava flows rich in iron and magnesium at or near the Earth's surface.
Uses & applications
Used widely in construction as crushed stone for aggregate, railroad ballast, and in the manufacturing of rock wool insulation.
Geological facts
Basalt is the most common rock type in the Earth's crust underlying the world's ocean basins and forming much of the volcanic islands.
Field identification & locations
Easily identified by its dark, dense, fine-grained appearance, often found in stream beds, beaches, and volcanic regions.
