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rock dust

a crushed limestone sprayed on surfaces in mines to make coal dust incombustible in case of a gas explosion.
Origin of rock dust
1930-35 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for rock-dust
Historical Examples
  • 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 Francis Rolt-Wheeler
  • Rain and rock-dust had smeared all things alike in this gray roasting shambles.

    She Buildeth Her House Will Comfort
  • Little clouds of rock-dust rose above the bear, in front of him, behind him, and below him.

    Tenting To-night Mary Roberts Rinehart

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