- a crushed limestone sprayed on surfaces in mines to make coal dust incombustible in case of a gas explosion.
Origin of rock dust
Examples from the Web for rock dust
Historical Examples of rock dust
Rain and rock-dust had smeared all things alike in this gray roasting shambles.She Buildeth Her House
Little clouds of rock-dust rose above the bear, in front of him, behind him, and below him.Tenting To-night
Mary Roberts Rinehart
The flame of the explosion can't pass through and the fire can't jump a rock-dust barrier.The Boy With the U.S. Miners