Crusher dust, also known as blue metal, cracker or more commonly, rock dust, is simply the material leftover when making crushed rock. As rocks are run through the crusher, tiny pieces and dust particles are left behind. Instead of being thrown out as waste material, the dust is recycled and becomes a valuable product with many practical applications in both commercial construction and home projects.
Rock dust is a combination of small, gritty pieces of rock and dust, though it typically has more dust than gritty pieces. Just be aware that it’s a natural product, so you often see different sizes, shapes, and colours in the material.