millstone

[millstone]
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.

Since old millstones were sometimes tied around the necks of the condemned in order to keep them under water, the millstone has become an emblem for

Category: Emblems of the Faith, New Catholic Dictionary  |  Trackback