Basalt
Basalt is a common extrusive igneous rock formed from the rapid cooling of basaltic lava exposed at or very near the surface of a planet or moon. It is typically a dense, fine-grained rock often black or dark green in color. Basalt is used in construction, such as building blocks, cobblestones, and making statues. In maritime context, basalt is used as a material for shipbuilding due to its durability and resistance to corrosion. It is also used as a ballast material to provide stability to ships and offshore structures.
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