I guess you could offload Chalk production as Alchemy for these reasons: https://www.differencebetween.com/diffe ... and-chalk/ https://www.compoundchem.com/2016/03/26/eggs/
But realistically chalk is separately mined, and a much softer sedimentary rock than other forms of limestone. It would be better implemented as it's own node in lvl 1 mines with bonus flint drops.