gritstone

Etymology

From grit + stone.

gritstone means A form of sedimentary rock, similar to sandstone but coarser. Lexicurio rates it Rare gem — a strength score of 84 out of 100.

noun

A form of sedimentary rock, similar to sandstone but coarser.“So Tom went to go down; and first he went down three hundred feet of steep heather, mixed up with loose brown grindstone, as rough as a file […]”