rock flour

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rock flour

[′räk ‚flau̇·ər]
(geology)
A fine, chemically unweathered powder of rock-forming minerals produced by pulverization of rock fragments during natural transport or crushing. Also known as glacial flour.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

rock flour

A very finely powdered rock material; Also see silt.

silt, inorganic silt, rock flour

A granular material that is nonplastic or very slightly plastic and exhibits little or no strength when air-dried; usually has a grain size between 0.002 mm and 0.05 mm in diameter.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
More recently, C&E began supplying an ultra-fine grind of rock dust that is used by underground coal mines to neutralize coal dust and reduce the risk of ignition.
Nagamanib, "Strength and durability properties of concrete containing quarry rock dust as fine aggregate," Journal of Engineering and Applied Sciences, vol.
The main trouble spot was on the A48 near the Five Mile Lane and gritting lorries were sent out to spread crushed rock dust on melting tar to create non-stick road surfaces.
Bradway said Down to Earth first began selling the crushed volcanic basalt last fall and now also mixes the Cascade Minerals rock dust into its own blended fertilizers.
Rock dust drilled from sediments in the giant Gale crater on the red planet were found to contain clay minerals that can have formed only in water, scientists said.
Liquid seaweed and kelp-based foliar sprays offer a good source of nitrogen and potassium, while rock dust supplies phosphorus.
Curiosity snapped a picture of the rock dust in the scoop with one of its own cameras.
So to ignimbrite, a word of apparently Latin origin that means "fiery rock dust cloud." How exciting, I think, as I read on to discover that the stones used to build the non-cave parts of my house must all have been made of this hitherto unknown material, a volcanic rock that was created by the eruption of a volcano many millions of years ago.
Rock dust will add minerals to the soil, which in turn adds minerals to your plants.
Fuel for a prolonged, larger explosion was then provided by coal dust, which had been inadequately mixed with noncombustible rock dust. Besides finding low deployment of rock dust, investigators faulted the company for not adequately ventilating the mine.
Saying that, the title track from new album, Rock Dust Light Star, went well with the show's space exploration theme: an inflatable solar-system levitating above the stage.