Basalt

Basalt is an environment block in Mindustry representing basalt terrain on the map; it is a natural, non-item entity used to define the game’s terrain and map surfaces rather than a buildable structure or unit. As an environment block, Basalt functions as part of world generation and level geometry and does not itself consume or produce items, fluids, or power; it is referenced by map data and pathing systems and interacts with other game systems only insofar as terrain type affects placement and navigation.