I have used lots of large 4" tavertine in my tank...no problem. It is limestone (calcium carbonate) but its purity might be in question. Just try to buy the whitest tavertine you can find because colour is indication of purity.
As for the small 1"x1" tavertine or other tiles...they come with glue on the back that is not easily removed....I would be more worried about that glue. At least that is why I havent tried them.
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