Basalt Rocks

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Basalt is a dark-colored, fine-grained, igneous rock composed mainly of plagioclase and pyroxene minerals. It most commonly forms as an extrusive rock, such as a lava flow, but can also form in small intrusive bodies, such as an igneous dike or a thin sill. It has a composition similar to gabbro . The difference between basalt and gabbro is that basalt is a fine-grained rock while gabbro is a coarse-grained rock.