buhrstone

[bur-stohn]
noun
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buhrstone, burstone or burrstone (ˈbɜːˌstəʊn)
 
n
1.  a hard tough rock containing silica, fossils, and cavities, formerly used as a grindstone
2.  a grindstone or millstone made of this rock
 
[C18 burr, perhaps identical to burr1 (alluding to roughness)]
 
burstone, burstone or burrstone
 
n
 
[C18 burr, perhaps identical to burr1 (alluding to roughness)]
 
burrstone, burstone or burrstone
 
n
 
[C18 burr, perhaps identical to burr1 (alluding to roughness)]

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Example sentences
The buhrstone trends from northwest to southeast, while the younger.
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