basalt

As nouns the difference between basalt and pentagonite

is that basalt is a hard mafic igneous rock of varied mineral content; volcanic in origin, it makes up much of the Earth's oceanic crust while pentagonite is a silicate of calcium and vanadium found in basalts and tuffs.

As nouns the difference between basalt and mugearite

is that basalt is basalt while mugearite is (mineralogy) a kind of orthoclase-bearing basalt that is made up of olivine, apatite, and opaque oxides.

As nouns the difference between basalt and cryptomaria

is that basalt is basalt while cryptomaria is (geology) mare basalt deposits, buried under the regolith of the moon.