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29th October 2018 11:11 #12Registered User
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29th October 2018 11:25 #13
MILLSTONE
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.[2]
Millstones used in Britain were commonly of two types:
Derbyshire Peak stones of grey Millstone Grit, cut from one piece, used for grinding barley; imitation Derbyshire Peak stones are used as decorative signposts at the boundaries of the Peak District National Park. Derbyshire Peak stones wear quickly and are typically used to grind animal feed since they leave stone powder in the flour, making it undesirable for human consumption.
French burrstones, used for finer grinding. French Burr comes from the Marne Valley in northern France. The millstones are not cut from one piece, but built up from sections of quartz cemented together, backed with plaster and bound with shrink-fit iron bands. Slots in the bands provide attachments for lifting. In southern England the material was imported as pieces of rock, only assembled into complete millstones in local workshops.[3]
In Europe, a third type of millstone was used. These were uncommon in Britain, but not unknown:
Cullen stones, (stones from Cologne), a form of black lava quarried in the Rhine Valley at Mayen near Cologne, Germany.




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