igneous
Basalt Pebble
Aphanitic Extrusive Igneous Rock
AI-generated identification · may be incorrectHardness of 6 on the Mohs scale, dark gray to black color, dull luster, and fine-grained microcrystalline structure.
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Physical properties
Hardness of 6 on the Mohs scale, dark gray to black color, dull luster, and fine-grained microcrystalline structure.
Formation & geological history
Formed from the rapid cooling of low-viscosity, mafic lava flows at the Earth's surface.
Uses & applications
Commonly used in construction aggregate, road base, and landscaping materials.
Geological facts
Basalt is the most common rock type in the Earth's crust underlying the ocean basins and forming much of the volcanic islands.
Field identification & locations
Identify by its dark, dense appearance and smooth, water-worn texture found along riverbeds and beaches.
