There are brushed available for this. I believe John has been testing some from Alpha, but there are others as well.

On Thu, Oct 13, 2011 at 9:45 PM, Mike Marsoun <nulifesc@bigpond.com> wrote:
I have a friend (no really) who resurfaced so badly mineral stained cleft quartzite with bush hammers and now it looks badly frosted. He is looking into diamond brushes. Any other ideas, other than flattening and honing.
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