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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
First recorded in 1930-35 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for rock dust
Historical Examples
  • This is in contrast to the gravel road, where little dependence is placed upon the bonding effect of the rock dust.

  • A cloud of rock dust rose and filled the air completely for several minutes.

    Watched by Wild Animals Enos A. Mills
  • Then, once in a great while, a third kind will descendthe accumulated snow and ice and rock dust of maybe half a century or more.

    Boy Scouts in Glacier Park Walter Prichard Eaton

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