Yeah I understand that the animals aren't actually turning to stone, more of an extreme calcification process. I have also stumbled upon some advanced research being done on the subject. Not any of these in particular but something called Nucleophilic Substitution
https://basicmedicalkey.com/nucleophilic-substitution-addition-and-elimination-reactions/
Maybe I'm misunderstanding your comment, but nucleophilic substitution isn't very advanced chemistry.
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