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A very good millstone is generally rich in silica: the higher the percentage, the stronger the rock, silica being the hardest common mineral on the Earth's surface. The same is true of sandstone with siliceous cement, where the percentage of silica is high because both the grains and the cement are siliceous in nature.
Quern-stones have been used by numerous civilizations throughout the world to grind materials, the most important of which was usually grain to make flour for bread-making. They were generally replaced by millstones once mechanised forms of milling appeared, particularly the water mill and the windmill , although animals were also used to ...
Derwent Edge is a Millstone Grit escarpment that lies above the Upper Derwent Valley in the Peak District National Park in the English county of Derbyshire. An Ordnance Survey column marks the highest point of the Edge at Back Tor (538 metres, 1765 feet). [1] North of Back Tor the edge extends into Howden Edge and enters the county of South ...
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The Millstone Grit Group is a formal stratigraphic term for this sequence of rocks. The gritstone edges of the Peak District are an important climbing area and the rock is much relished by English climbers , among whom it has almost cult status and is often referred to as "God's own rock". [ 3 ]
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