Rocks such as basalt, on the right side of the igneous rock classification, are darker-colored and have higher specific gravity than do rocks such as granite, on the left side.

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Basalt is a mafic rock, meaning it's richer in magnesium and iron, which contributes to its darker color and higher specific gravity. Granite, on the other hand, is a felsic rock, containing more silica, making it lighter in color and less dense.

Rocks Such as Basalt, on the Right Side of the Igneous