Table 2

Classification of non-stoichiometric perovskites.

CompositionIdealSp. gp.Tilt
A-site vacant hydroxide perovskites
Single hydroxide perovskites
Söhngeite subgroup
 Dzhalindite(In,Fe)(OH)6In(OH)3ImEmbedded Imagea+a+a+
 Söhngeite(Ga,Al,Fe)(OH)3·xH2OGa(OH)3P42/nmc or P42/na+a+c
 Bernalite(Embedded ImageSi0.06Zn0.01)[(OH)2.95O0.04]Fe(OH)3Pmmna+b+c
Double hydroxyperovskites
Schoenfliesite subgroup
 Schoenfliesite#(Mg0.94Mn0.13)1.07Sn0.97(OH)6MgSn(OH)6PnEmbedded Imagea+a+a+
 Burtite(Ca0.98Mg0.02)Sn(OH)6·0.39H2OCaSn(OH)6PnEmbedded Imagea+a+a+
 JeanbandyiteEmbedded ImageSn(OH)(6–x)Ox(1≥x ≥ 0.5)Fe3+Sn(OH)5OPnEmbedded Imagea+a+a+
 Mushistonite(Cu0.48Zn0.39Fe0.17)1.04Sn(OH)5.95CuSn(OH)6PnEmbedded Imagea+a+a+
 Natanite#(Fe0.46Zn0.36Cu0.28)Sn(OH)6.09FeSn(OH)6PnEmbedded Imagea+a+a+
 Vismirnovite(Zn0.89Fe0.08Cu0.1)Sn(OH)6.04ZnSn(OH)6PnEmbedded Imagea+a+a+
 Wickmanite#(Mn095Mg0.03Ca0.2)Sn(OH)6MnSn(OH)6PnEmbedded Imagea+a+a+
Stottite subgroup
 Stottite(Embedded ImageMg0.03Mn0.03Ca0.01)1.22Ge0.95(OH)6FeGe(OH)6P42/na+a+c
 MopungiteNaSb(OH)6NaSb(OH)6P42/na+a+c
 Tetrawickmanite[(Mn0.94Fe0.05Ca0.01)(Sn0.98Si0.11Al0.010(OH)6MnSn(OH)6P42/na+a+c

# Extensive solid solution exists between natanite, schoenfliesite and wickmanite from Pitkäranta (Nefedov et al., 1977). Composition = compositional range of the mineral. Ideal = ideal composition of the end-member molecule. Sp. gp. = space group. Tilt = Glazer (1972) tilt scheme.