Dark Concrete

Dark Concrete is a building Block added by GregTech.

It is made by processing Light Concrete with water in a Chemical Reactor.

There are different Types of Concrete: Concrete, Concrete Cobblestone, Mossy Concrete Cobblestone, Concrete Bricks, Cracked Concrete Bricks, Mossy Concrete Bricks, Chiseled Concrete, and Smooth Concrete. Brick, Chiseled, and Smooth versions also stop Mobs from Spawning above them.

All Types of Concrete give a slight speed boost while walking on them. Two layers of Concrete, or Concrete with Ice below it, produce an odd interaction that can accelerate a player to roughly 90 meters per second, fast enough to outrun most servers' chunk loading. Sneaking while on Concrete negates its speed boost, and can be used to slow down from extreme speeds.