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Thread: Dan's Whetstone True Hard

  1. #21
    Senior Member blabbermouth
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    Thuringian is slate, thus more analogous to Welsh or Vermont slates than Arkansas stones.

    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.
    Pulled from:

    http://strazors.com/uploads/images/articles/escher.pdf

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