igneous
Basalt Pebble
Extrusive igneous rock
AI-generated identification · may be incorrectHardness 6 on Mohs scale, dark gray to black color, fine-grained aphanitic texture with dull to sub-vitreous luster.
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Physical properties
Hardness 6 on Mohs scale, dark gray to black color, fine-grained aphanitic texture with dull to sub-vitreous luster.
Formation & geological history
Formed from the rapid cooling of low-viscosity basaltic lava flows exposed at or near the Earth's surface.
Uses & applications
Used in construction aggregates, railroad ballast, dimension stone, and landscaping.
Geological facts
Basalt is the most common rock type in the Earth's crustal portions underlying the ocean basins and forms much of the lunar maria.
Field identification & locations
Commonly found in riverbeds and beaches where tumbling rounds the dark volcanic fragments.
