rock salt

common salt occurring in extensive, irregular beds in rocklike masses.

1700–10 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rock salt
another name for halite

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
The rock salt applied to icy roads in the winter is the same substance that
  comes out of your salt shaker.
Rock salt and bread by the doorstep to placate any resident gods.
Rock salt shall meet the satisfaction of the engineer.
Salt also comes from commercial properties as many apply rock salt to
  driveways, parking lots and building entrances.
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