Seal or not?

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guitarman

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I'm looking at installing a kitchen backsplash with a mosaic combination of glass, stainless steel and what I thought was a natural stone but on the back of the packaging says its mica. Its a very smooth feeling stone that seems to have a bit of a gloss on it. Will I have to seal this prior to grouting?
 
Sealing prior to the application of the grout will affect the grout's adhesion.
 
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