Ferrierite Subgroup

The ferrierite subgroup includes:

ferrierite-K: (K,Na)₅(Si₃₁Al₅)O₇₂.18H₂O
ferrierite-Mg: [Mg₂(K,Na)₂Ca_0.5](Si₂₉Al₇)O₇₂.18H₂O
ferrierite-Na: (Na,K)₅(Si₃₁Al₅)O₇₂.18H₂O
ferrierite-NH₄: (NH₄,Mg_0.5)₅(Al₅Si₃₁O₇₂).22H₂O

The ferrierite subgroup is a member of the zeolite group

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