Millstones are used in windmills and watermills for grinding wheat or other grains. The type of stone most suitable for making millstones is a siliceous rock called buhrstone (or burrstone), an open-textured, porous but tough, fine-grained sandstone, or a silicified, fossiliferous limestone. In some sandstones, the cement is calcareous. Old millstones were sometimes tied around the necks of the condemned in order to keep them under water.

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Additional Information

MLA Citation

  • “millstone“. Emblems of the Faith. CatholicSaints.Info. 6 December 2008. Web. 25 January 2022. <>