igneous
Porphyritic Basalt
Extrusive igneous rock
AI-generated identification · may be incorrectHardness of 6 on Mohs scale, grayish-brown color with lighter plagioclase phenocrysts, dull luster, aphanitic to porphyritic texture.
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Physical properties
Hardness of 6 on Mohs scale, grayish-brown color with lighter plagioclase phenocrysts, dull luster, aphanitic to porphyritic texture.
Formation & geological history
Formed from rapidly cooling lava flows on the Earth's surface, often associated with volcanic activity and basaltic magmas.
Uses & applications
Used in construction, aggregate for roadbeds, and occasionally as a decorative stone.
Geological facts
Basalt is the most common rock type in the Earth's crust beneath the oceans and also forms much of the lunar maria.
Field identification & locations
Identified by its fine-grained dark matrix interspersed with distinct visible mineral crystals; found globally in volcanic regions.
