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The Mühlsteinbrüche ("Millstone Quarries") south of Jonsdorf in the Zittau Mountains in Saxony are a region of bizarre rock formations, which have been formed by the quarrying of sandstone for millstones and also by weathering processes. They are a popular hiking and climbing area.
The type of stone most suitable for making millstones is a siliceous rock called burrstone (or buhrstone), an open-textured, porous but tough, fine-grained sandstone, or a silicified, fossiliferous limestone. In some sandstones, the cement is calcareous. [42] On a historical scale, it seems that most types of rock have been used in milling.
The Chatsworth Grit has also proved suitable for making millstones. Besides the widespread mining of coal, ironstone, clay and fire-clay have been extracted from the Coal Measures sequence. The overlying Warwickshire Group rocks have yielded not only building stone but also clays for brick-making and in the case of the Etruria Formation, for ...
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 ...
The natural condition for the quernstone and millstone production in the area is the rock type garnet mica schist. The quarries are located from the shoreline up until approx. 200 m above sea level, but a majority is situated less than one kilometer from the sea and closest harbor.
Quartz dolerite or quartz diabase is an intrusive rock similar to dolerite (also called diabase), but with an excess of quartz. Dolerite is similar in composition to basalt, which is volcanic, and gabbro, which is plutonic. The differing crystal sizes are due to the different rate of cooling, basalt cools quickly and has a very fine structure ...
Roller grain mills are an alternative to traditional millstone arrangements in gristmills. Roller mills for rock complement other types of mills, such as ball mills and hammermills , in such industries as the mining and processing of ore and construction aggregate ; cement milling ; and recycling .
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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