igneous
Banded Basalt
Extrusive Igneous Rock
AI-generated identification · may be incorrectHardness of 6 on the Mohs scale, dark gray to black color with lighter mineral banding, fine-grained aphanitic texture with vitreous to dull luster.
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Physical properties
Hardness of 6 on the Mohs scale, dark gray to black color with lighter mineral banding, fine-grained aphanitic texture with vitreous to dull luster.
Formation & geological history
Formed from the rapid cooling of magnesium- and iron-rich lava flows at the Earth's surface, often during the Precambrian to Cenozoic eras.
Uses & applications
Used primarily in aggregate for construction, road building, railroad ballast, and occasionally as decorative landscaping stones.
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 in the field by its dark color, fine-grained matrix, and distinct flow banding; commonly found near ancient volcanic regions worldwide.
