On the base of generalization of crystallo-chemical peculiarities of the scapolite group minerals and taking into consideration dependence between their composition and crystal lattice metrics, it was shown that their structural features, as well as the real composition don't correspond to an uninterrupted isomorphic row between two components: marialite and meionite. On the contrary, there are no less than three discrete ranges of isomorphism for scapolites.
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