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.G: Uranyl Hydroxides

4.GA. Without additional cations
4.GA.05. Schoepite group
Schoepite (UO2)8O2(OH)12 · 12 H2O orth., P21ca     A
Metaschoepite (UO2)8O2(OH)12 · 10 H2O orth., Pbna FOTOG
Paraschoepite UO3 · 2-x H2O orth., Pbca Q

4.GA.10. Ianthinite group
Ianthinite U4+2(UO2)4O6(OH)4 · 9 H2O orth., P21cn G

4.GA.15. Studtite group
Studtite (UO2)O2(H2O)2 · 2 H2O mon., C2/m (?) G
Metastudtite (UO2)O2(H2O)2 orth., Immm IMA 1981-055

4.GA.20. Paulscherrerite group *
Paulscherrerite * (UO2)(OH)2 mon. IMA 2008-022

4.GA.25. Heisenbergite group *
Heisenbergite * (UO2)(OH)2 · H2O mon., P212121 (?) IMA 2010-076

4.GB. With additional cations (K, Ca, Ba, Pb, etc.): with mainly UO2(O,OH)5 pentagonal polyhedra
4.GB.05. Compreignacite group
Compreignacite K2(UO2)6O4(OH)6 · 7 H2O orth., Pnmn FOTOIMA 1964-026
Agrinierite K2Ca(UO2)6O6(OH)4 · 5 H2O orth., Cmmm IMA 1971-046
Rameauite K2Ca(UO2)6O8 · 9 H2O mon., C2/c FOTOIMA 1971-045

4.GB.10. Becquerelite group
Becquerelite Ca(UO2)6O4(OH)6 · 8 H2O orth., Pn21a FOTOG
Billietite Ba(UO2)6O4(OH)6 · 8 H2O orth., Pbn21 G
Protasite Ba(UO2)3O3(OH)2 · 3 H2O mon., Pn IMA 1984-001

4.GB.15. Richetite group
Richetite (Fe,Mg)xPb8.6(UO2)36O36(OH)24 · 41 H2O tric., P1 G

4.GB.20. Calciouranoite group
Calciouranoite (Ca,Ba,Pb)(UO2)2O3 · 5 H2O (?) A
Metacalciouranoite (Ca,Na,Ba)(UO2)2O3 · 2 H2O (?) IMA 1971-054
Bauranoite Ba(UO2)2O3 · 4 - 5 H2O (?) FOTOIMA 1971-052

4.GB.25. Fourmarierite group
Fourmarierite Pb1-xO3-2x(UO2)4(OH)4+2x · 4 H2O orth., Bb21m FOTOG

4.GB.30. Wölsendorfite group
Wölsendorfite Pb7(UO2)14O19(OH)4 · 12 H2O orth., Cmcm G

4.GB.35. Masuyite group
Masuyite Pb(UO2)3O3(OH)2 · 3 H2O mon., Pn G

4.GB.40. Vandendriesscheite group
Vandendriesscheite Pb1.6(UO2)10O6(OH)11 · 11 H2O orth., Pbca G
Metavandendriesscheite Pb(UO2)7O8 · 12 H2O orth. G

4.GB.45. Vandenbrandeite group
Vandenbrandeite Cu(UO2)(OH)4 tric., P-1 G

4.GB.50. Sayrite group
Sayrite Pb2(UO2)5O6(OH)2 · 4 H2O mon., P21/c IMA 1982-050

4.GB.55. Curite group
Curite Pb3+x((UO2)4O4+x(OH)3-x)2 · 2 H2O orth., Pnam FOTOG

4.GB.60. Iriginite group
Iriginite Mo2(UO2)O7 · 3 H2O orth., Pcam (?) FOTOG

4.GB.65. Uranosphaerite group
Uranosphaerite Bi(UO2)O2(OH) mon., P21/n FOTO ENTDECKUNGG

4.GB.70. Holfertite group
Holfertite (UO2)1.75Ca0.25TiO4 · 3 H2O trig., P3 IMA 2003-009

4.GC. With additional cations: with UO2(O,OH)6 hexagonal polyhedra
4.GC.05. Clarkeite group
Clarkeite Na(UO2)O(OH) · n H2O trig., R-3m FOTOG

4.GC.10. Umohoite group
Umohoite Mo(UO2)O4 · 2 H2O tric., P1 FOTOG

4.GC.15. Spriggite group
Spriggite Pb3(UO2)6O8(OH)2 · 3 H2O mon., C2/c IMA 2002-014

* new, not in Nickel & Nichols (2009), preliminary grouping

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 - 2012)