rock dust

American  

noun

1. a crushed limestone sprayed on surfaces in mines to make coal dust incombustible in case of a gas explosion.

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Etymology

Origin of rock dust

First recorded in 1930–35

Example Sentences

Later, he used lasagna mulching to smother persistent ivy with layers of wet cardboard and a mulch of wood chips, sawdust and coffee grounds from a local cafe, as well as rock dust to re-mineralize the soil.

From Los Angeles Times

In a freshly excavated disposal tunnel, Mustonen explains over the roar of ventilator fans that the peculiar smell comes from rock dust mixed with a trace of explosives.

From Science Magazine

Later, they learn about attempts to capture carbon dioxide in rock dust, an approach called enhanced weathering.

From Salon

Into the excavated area, shovel porous drainage material such as sand or rock dust, tamping it well and smoothing it as you proceed.

From Washington Times

Eastern time today, a visitor from Earth fell from a clear, cold Martian sky into a 3.5-billion-year old, 50-kilometer-wide bowl of rock, dust and volcanic ash called Jezero Crater that once held a large lake.

From Scientific American