spaller
/ˈspɔlər/
noun
- A small piece of stone, rock, or other hard material that has broken off a larger piece.
- The hiker felt a sharp spaller hit his leg as the cliff face crumbled.
- Workers wore safety goggles to protect their eyes from flying spallers during the demolition.
- A tiny spaller of concrete lodged in the mechanic's boot after he chipped the old pavement.