rock flour


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Related to rock flour: Glacial flour

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.

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.
References in periodicals archive ?
The lake it looks out on is an unbelievable turquoise colour, caused by glacial sediment known as rock flour, which is suspended in the water and catches the light.
That must be of concern because it is thanks to glaciers and material called rock flour, which scatters blue-green rays of light, that we have the dazzling turquoise water of Lake Peyto and its more famous sister, Lake Louise.
As they grind their way along the stony terrain, they produce prodigious amounts of rock flour.