Gritstone
Gritstone is a
sedimentary rock composed of coarse sand grains with inclusions of small stones. It is a coarser version of
sandstone. It was laid down in the late (upper)
Paleozoic era, in the
Carboniferous period, in delta conditions.
Gritstone is a
sedimentary rock 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.
The rock is much loved by British
climbers among whom it has almost cult status and is often referred to as "God's own rock". The rough surface providing outstanding friction, allows climbers to stand on or grip the subtlest of features in the rock.
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List of minerals*
List of stone
