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. 2014.
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Example sentences
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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