You need a little patience---it may take 2 to 3 weeks for the cement materials (and the added water) to dry completely.
Mold should not be an issue if thinset was used to set the marble.
Marble is very absorbent and takes a while to completely dry.---Mike----
Mold should not be an issue if thinset was used to set the marble.
Marble is very absorbent and takes a while to completely dry.---Mike----