GRITSTONE
Gritstone
Gritstone or grit is a hard, coarse-grained, siliceous sandstone. This term is especially applied to such sandstones that are quarried for building material. British gritstone was used for millstones to mill flour, to grind wood into pulp for paper and for grindstones to sharpen blades. "Grit" is often applied to sandstones composed of angular sand grains. It may commonly contain small pebbles.The above text is a snippet from Wikipedia: Gritstone
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gritstone
Noun
- A form of sedimentary rock, similar to sandstone but coarser.
The above text is a snippet from Wiktionary: gritstone
and as such is available under the Creative Commons Attribution/Share-Alike License.