Grindstone
Round sharpening stone / From Wikipedia, the free encyclopedia
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This article is about the traditional metalworking tool. For industrial grinding wheels, see Grinding wheel. For grindstones used to process foods, see millstone. For the 2019 video game, see Grindstone (video game). For the neighbourhood in Queensland, Australia, see Grindstone, Queensland.
A grindstone, also known as grinding stone, is a sharpening stone used for grinding or sharpening ferrous tools, used since ancient times. Tools are sharpened by the stone's abrasive qualities that remove material from the tool through friction in order to create a fine edge. Similar to sandpaper, each stone has a different grit that will result in sharper or duller tools. In Australia, Aboriginal peoples created grinding grooves by repeated shaping of stone axes against outcrops of sandstone.