igneous
Basalt Pebble
Extrusive Igneous Rock
AI-generated identification · may be incorrectHardness 6 on Mohs scale, dark gray to black color, aphanitic texture with a dull luster, specific gravity around 2.9.
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Physical properties
Hardness 6 on Mohs scale, dark gray to black color, aphanitic texture with a dull luster, specific gravity around 2.9.
Formation & geological history
Formed from the rapid cooling of low-viscosity basaltic lava exposed at or very near the Earth's surface.
Uses & applications
Commonly used in construction, as road aggregate, railroad ballast, and sometimes in landscaping.
Geological facts
Basalt is the most common rock type in the Earth's crust underlying the world's oceans.
Field identification & locations
Identify by its dark, fine-grained appearance, often smooth and rounded from water transport in rivers or beaches.
