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Fire Agate

I have an urge to try to tumble Fire Agate. Mexican or otherwise. I have inferred from one source that the matrix needs to be ground away before you can tumble it. But doing so could destroy the "fire windows". Another source has led me to believe that the full tumbling process will be enough to remove the matrix, but again has potential do destroy the "windows". What can you, my fellow gentle lapidaryists (?) contribute to my confusion?

Regards,
Don

From Don - April 15, 2008 at 08:15:14

Message: 66389

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Bob Keller