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Brownmillerite subgroup

[ A₂ ][ B₂ ][ O₅[] ], [ A₃ ][ B₃ ][ O₈[] ]

• [ A ][ B ]
• [ Ca ][ Fe³⁺Al ] Brownmillerite
• [ Ca ][ Fe²⁺₂ ] Srebrodolskite
• [ Ca ][ TiFe³⁺Al ] Shulamitite

• Class: Non-stoichiometric anion vacant group (ABX_2.5-3) < Non-stoichiometric perovskites < Perovskite supergroup
• Group: Ibm2, Pcmn, Pmma