What makes dark colored basalt rock?

Answer 1

Dark-colored basalt rock is primarily composed of minerals such as pyroxene and plagioclase feldspar, which are rich in iron and magnesium. This mineral composition gives basalt its characteristic dark hue, often appearing black or dark gray. The rapid cooling of lava during volcanic eruptions contributes to its fine-grained texture and dark coloration, as the minerals do not have time to crystallize into larger forms. Additionally, the presence of volcanic gases can influence the specific color and texture of the basalt as it solidifies.