Blue Metal 14mm

In Australia, “blue metal” refers to crushed rock aggregate—typically a hard, natural volcanic rock like basalt or dolerite (and sometimes high-density granite). It gets its name from its distinctive, sharp angular shape and dark blue-grey colouring when freshly quarried.Because it is incredibly dense, heavy-duty, and does not break down over time, it is one of the most vital materials used in construction, plumbing, and landscaping.