uses of grinding stone wikipedia
Millstone Wikipedia
The type of stone most suitable for making millstones is a siliceous rock called burrstone (or buhrstone), an opentextured, porous but tough, finegrained sandstone ...
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A stone tool is, in the most general sense, any tool made either partially or entirely out of stone. Although stone tooldependent societies and cultures still exist ...
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The type of stone most suitable for making millstones is a siliceous rock called burrstone (or buhrstone), an opentextured, porous but tough, finegrained sandstone ...
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