Sanded grout used by mistake with marble

nihalh

We have used sanded grout with marble tiles by mistake, will that cause any problems later other than scratching the marble tiles?
I read something about "you won't be able to polish it later if you used sanded grout", do you know something about that?
I also want to ask if the polished marble tiles have some spots that seem to be unpolished or slightly lower in level than the entire tile, would that mean it's a low grade marble or something?
Appreciate your help

jlhaslip

on a floor? what size are the grout lines.
Sanded grout for floors or grout lines over 1/8th inch.

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nihalh

sanded grout for floors, grout line slightly less than 1/4 inch

nihalh

ok sorry,my husband says he used a 1/16 tile separator and sanded grout for the marble floor tiles