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    The firing bit requires some serious...

    The firing bit requires some serious experimentation.

    If mother nature does the firing the stone is called metamorphic.
    Like ceramics the "natural firing" can be 022 cone to ten cone and beyond....
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    The age of needing natural hone stone is long...

    The age of needing natural hone stone is long past.
    Thus the local quarries and pits will be mostly forgotten.

    There are two keys -- mineralogy and grain size.
    The grain size is the hard part...
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