Perovskite Supergroup

The structural Perovskite Supergroup was established and approved by IMA in 2016. It is defined by Mitchell et al. (2017) as those minerals whose structures consist of three-dimensional networks of corner-sharing octahedra and which adopt the aristotypic ADX₃ perovskite structure or those of its derivatives. It consist of cubic to pseudocubic simple AXO₃ oxides.
It is divided in two major groups: Stoichiometric Perovskites (with a ADX₃ stoichiometry) and Non-stoichiometric Perovskites (with A₂DD'X₆ stoichiometry.
The non-stochiometric perovskites also includes hydroxide- and arsenide-based minerals (also known as defect perovskites, characterized by A- and/or D-site vacancies together with the anion-deficient minerals of the brownmillerite subgroup and hematophanite subgroup).
Several members are technologically very important ferroelectrics.

There is also a further division with subgroups and potential subgroups proposed; this nomenclature connects some species that are not necessarily similar in terms of chemistry alone:

Stoichiometric Perovskites

Subgroup Definition Bridgmanite Subgroup Silicate single perovskites Perovskite Subgroup Oxide single perovskites Neighborite Subgroup Fluoride single perovskites Chlorocalcite Subgroup Chloride single perovskites Cryolite Subgroup D-site cation-ordered double fluoride perovskites Vapnikite Subgroup D-site cation-ordered double oxide perovskites Sulphohalite Subgroup D-site cation-ordered double antiperovskites

Non-stoichiometric Perovskites

Subgroup Definition Söhngeite Subgroup Schoenfliesite Subgroup Stottite Subgroup A-site vacant double hydroxide perovskites Brownmillerite Subgroup Anion-deficient perovskites Skutterudite Subgroup A-site vacant quadruple perovskites Oskarssonite Subgroup D-site vacant single perovskites Cohenite Subgroup Auricupride Subgroup D-site vacant inverse single perovskites Diaboleite Subgroup D-site vacant double perovskites Hematophanite Subgroup Anion-deficient partly-inverse D-site quadruple perovskites