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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.
1930-35 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for rock dust
  • rock dust on the green felt, cowboy ballads on the jukebox.
  • He maintains that bags of rock dust had been placed there and that when he left the area it was white in color.
  • Employee was carrying rock dust bags from the rock dust car to a battery powered scoop.
  • If rock dust is used as fire protection along such haulage tracks, the rock dust shall be in a dry, usable condition at all times.

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