Gritstone

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What Wikipedia says

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.

Excerpt from the Wikipedia article “Gritstone”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Helen Simonsson, CC BY-SA 2.0, via Wikimedia Commons.