Table 3 Average chemical formulae of the investigated zeolites.

STC	Zeolite	Calculated chemical formula	Zone	Ra	Rr	DEC	SEC
PHI	Phillipsite	(K_2.57 Ca_2.11 Na_1.26 Mg_0.03Ba_0.03) (Si_10.11 Al_5.89)O₃₂·11.33H₂O	1	0.63	0.62–0.64	K	Ca, Na, Mg, Ba
PHI	Phillipsite	(Ca_2.67 Na_1.60 K_1.48 Mg_0.22Ba_0.03) (Si_10.12 Al_5.88)O₃₂·8.61H₂O	1	0.63	0.63–0.64	Ca	Na, K, Mg, Ba
PHI	Phillipsite	(K_2.48 Ca_1.77 Na_1.73 Mg_0.02Ba_0.01) (Si_10.36 Al_5.64)O₃₂·7.98H₂O	3	0.65	0.64–0.66	K	Na, Ca, Mg, Ba
PHI	Phillipsite	(K_2.36 Ca_2.02 Na_1.58 Ba_0.03Mg_0.01) (Si_10.14 Al_5.86)O₃₂·11.34H₂O	4	0.63	0.62–0.64	K	Ca, Na, Ba, Mg
ANA	Analcime	Na_14.84Ca_1.03Mg_0.07K_0.05Ba_0.01 (Al_16.63Si_31.37) O₉₆ ·19.56H₂O		0.65	0.64–0.67	Na	Ca, Mg, K, Ba

Parameters STC structure type code, Ra average Si/(Si + Al), Rr range of Si/(Si + Al), DEC dominant extra-framework cations, SEC subordinate extra-framework cations as calculated by SEM–EDS analyses (see Supplementary Information).

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