according to 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
Methanhydrate-I 46 H2O · 8 CH4 cub., Pm-3n

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 group
Cuprite Cu2O cub., Pn-3m FOTOG

4.AA.15. Paramelaconite group
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 group
Crednerite Cu(Mn,Fe)O2 mon., C2/m ENTDECKUNGG

4.AB.10. Tenorite group
Tenorite CuO mon., C2/c FOTOA

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

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

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

4.AB.30. Palladinite group
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 group
Swedenborgite NaBe4SbO7 tetr., P42/mmc G

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

4.AC.15. Montroydite group
Montroydite HgO orth., Pnma FOTOG

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

4.AC.25. Massicot group
Massicot  /  Massicotite PbO orth., Pbcm FOTOG

in bold: grandfathered, IMA accepted, renamed and redefined (with IMA approval) minerals,
in normal letters: minerals published without IMA approval, questionable minerals, polytypes

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
GROUP = a name used to designate a group of species
N = Mineral published without approval of the CNMNC
Q = Questionable mineral
H = Hypothetical mineral (synthetic, anthropogenic, etc.)
D = Discredited by the CNMNC
Poly = Polytype

© Thomas Witzke / Stollentroll (2007 - 2009)