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46LikesThread: Dan's Whetstone True Hard
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08-09-2017, 10:43 PM #21Senior Member
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Thuringian is slate, thus more analogous to Welsh or Vermont slates than Arkansas stones.
Pulled from:Thuringian waterwhetstones are slate stones or more precisely mud slate. These slates
consist of quartz – which is the abrasive material, clay, mica (glimmer) and chlorite.
The soft waterwhetstones were found in upper-Devonian age deposits.
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