based on E.H. Nickel & M.C. Nichols (2009), H. Strunz & E.H. Nickel (2001)

(Oxides, Hydroxides, V[5,6]-Vanadates, Arsenites, Antimonites, Bismutites, Sulfites, Selenites, Tellurites, Iodates)

4.A: Metal : Oxygen = 2 : 1 and 1 : 1

4.AA. Cation : Anion (M : O) = 2 : 1 (and 1.8 : 1)
4.AA.05. Ice group
Ice  /  Eis H2O hex., P63/mmc G
Ice-VII  /  Eis-VII H2O cub., Pn-3m IMA 1017-029
Methanhydrate-I 46 H2O · 8 CH4 cub., Pm-3n -

The structure of Ice-VII is related to the structure of cuprite.
Methanhydrate is at time not described as a mineral. It is stable under higher pressures and/or low temperatures (23 atm and 0°C to 1 atm and ca. -80°C). Methanhydrate is a clathrate and isostructural with cubic melanophlogite (above ca. 40°C, melanophlogite is cubic, Pm-3n).

4.AA.10. Cuprite
Cuprite Cu2O cub., Pn-3m FOTO G

4.AA.15. Paramelaconite
Paramelaconite Cu1+2Cu2+2O3 tetr., I41/amd G

4.AB. Cation : Anion (M : O) = 1 : 1 (and up to 1 : 1.25), only with small and medium-sized cations
4.AB.05. Crednerite
Crednerite Cu(Mn,Fe)O2 mon., C2/m G

4.AB.10. Tenorite
Tenorite CuO mon., C2/c FOTO G

4.AB.15. Delafossite group
Delafossite CuFeO2 trig., R-3m FOTO G
Mcconnellite CuCrO2 trig., R-3m IMA 1967-037

4.AB.20. Zincite group
Bromellite BeO hex., P63mc G
Zincite ZnO hex., P63mc FOTO G

4.AB.25. Periclase group
Periclase MgO cub., Fm-3m FOTO G
Wüstite FeO cub., Fm-3m G
Bunsenite NiO cub., Fm-3m G
Manganosite MnO cub., Fm-3m FOTO G
Monteponite CdO cub., Fm-3m G
Lime  /  Calciumoxide CaO cub., Fm-3m FOTO G

4.AB.30. Palladinite
Palladinite PdO tetr., P42/mmc Q

4.AC. Cation : Anion (M : O) = 1 : 1 (and up to 1 : 1.25), with large cations (+/- small)
4.AC.05. Swedenborgite
Swedenborgite NaBe4SbO7 tetr., P42/mmc G

4.AC.10. Brownmillerite group
Brownmillerite Ca2Al2O5 orth., Ibm2 IMA 1963-017
Srebrodolskite Ca2Fe2O5 orth., Ibm2 FOTO IMA 1984-050

4.AC.12. Tululite
Tululite Ca14(Fe3+,Al)(Al,Zn,Fe3+,Si,P,Mn,Mg)15O36 cub., F23 IMA 2014-065

4.AC.15. Montroydite
Montroydite HgO orth., Pnma FOTO G

4.AC.20. Litharge group
Litharge  /  Lithargite PbO tetr., P4/nmm FOTO G
Romarchite SnO tetr., P4/nmm IMA 1969-006

4.AC.25. Massicot
Massicot  /  Massicotite PbO orth., Pbcm FOTO G


G = Grandfathered minerals: original description preceded the establishment of the CNMNC in 1959, and generally regarded as a valid species
A or IMA No. = Minerals approved by the CNMNC
Rd = Redefinition of the mineral approved by the CNMNC
Rn = Renamed with approval by the CNMNC
Q = Questionable mineral

© Thomas Witzke / Stollentroll (2007-2018)