I agree with Fred and the process.
John E Freitag
The Stone & Tile School
From: Fred Hueston [mailto:email@example.com]
Sent: Monday, July 16, 2012 5:06 PM
To: Restoration and Maintenance
Subject: RE: [sccpartners] Quartzite stone
First if it a true quartzite it should not etch..Especially if it is honed.. So I would approach it this way.
1, Try polishing the etch out with a standard marble polishing powder
2, If this doesn't work than try starting with a 400 grit diamond and bring it up till you achieve the hone
3, If its true quartzite than treat it like granite
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