Gritstone

Gritstone is a sedimentary rock composed of coarse sand grains and is a coarser version of sandstone.

Gritstone is usually laid down in water and frequently shows signs of cross bedding or current bedding .

It is quarried for building material. British gritstone was used for millstones to mill flour and sharpen blades, giving rise to its other common name of millstone grit.

See also

• List of minerals
• List of stone