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, dull to sub-vitreous luster, and specific gravity around 2.9.
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Physical properties
Hardness of 6 on the Mohs scale, dark gray to black color, fine-grained aphanitic texture, dull to sub-vitreous luster, and 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
Utilized in construction aggregates, road base materials, and sometimes carved into decorative stones or used in hot stone massage.
Geological facts
Basalt is the most common rock type in the Earth's oceanic crust and also forms extensive volcanic provinces on the continents.
Field identification & locations
Identify by its dark color, heavy weight relative to size, and smooth water-worn shape found abundantly in riverbeds and beaches.
