basalt -
the commonest type of solidified lava; a dense dark grey fine-grained igneous rock that is composed chiefly of plagioclase feldspar and pyroxene
volcanic rock extrusive igneous rock solidified near or on the surface of the Earth
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Wiktionary
Substantiv
basalt -
A hard maficigneous rock of varied mineral content; volcanic in origin, it makes up much of the Earth's oceanic crust.
Basalt is a common extrusive volcanic rock. It is usually grey to black and fine-grained due to rapid cooling of lava at the surface of a planet. It may be porphyritic containing larger crystals in a fine matrix, or vesicular, or frothy scoria.
