igneous
Basalt Pebble
Extrusive Igneous Rock
AI-generated identification · may be incorrectHardness of 6 on the Mohs scale, dark grey to black color, fine-grained aphanitic texture, and dull luster.
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Physical properties
Hardness of 6 on the Mohs scale, dark grey to black color, fine-grained aphanitic texture, and dull luster.
Formation & geological history
Formed from the rapid cooling of low-viscosity, magnesium- and iron-rich lava flows exposed at or near the Earth's surface.
Uses & applications
Commonly used in construction aggregate, railroad ballast, road base, and occasionally as decorative landscaping stones or hot massage stones.
Geological facts
Basalt is the most common rock type in the Earth's crust underlying the world's ocean basins and also forms much of the lunar maria.
Field identification & locations
Identified by its heavy weight, dark coloration, and extremely fine mineral crystals. Found globally along volcanic regions and riverbeds.
