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MINERAL CLASSIFICATION / SYSTEMATIK der MINERALE            according to E.H. Nickel & M.C. Nichols (2009), H. Strunz & E.H. Nickel (2001) 4. OXIDES, HYDROXIDES (Oxides, Hydroxides, V[5,6]-Vanadates, Arsenites, Antimonites, Bismutites, Sulfites, Selenites, Tellurites, Iodates) 4.F: Hydroxides 4.FA. Hydroxides with OH, without H2O; corner-sharing tetrahedra   4.FA.05. Behoite group        05 a. Behoite series Behoite Be(OH)2 orth., P212121 FOTO     IMA 1969-031      05 b. Clinobehoite series Clinobehoite Be(OH)2 mon., P21 IMA 1988-024   4.FA.10. Wülfingite group   Wülfingite Zn(OH)2 orth., P212121 FOTO IMA 1983-070 Sweetite Zn(OH)2 tetr., P41212 (?) FOTO IMA 1983-011 Ashoverite Zn(OH)2 tetr., P41/amd (?) FOTO IMA 1986-008   4.FB. Hydroxides with OH, without H2O; insular octahedra   4.FB.05. Sakhovite group   Sakhovite Hg4SbO3(OH)3 mon., Im IMA 1980-069   4.FB.10. Cualstibite group   Cualstibite Cu2AlSb(OH)12 trig. IMA 1983-068 Zincalstibite Zn2AlSb(OH)12 trig., P-3 IMA 1998-033   4.FC. Hydroxides with OH, without H2O; framework of corner-sharing octahedra   4.FC.05. Söhngeite group   Söhngeite Ga(OH)3 cub., Im-3 FOTO IMA 1965-022 Dzhalindite In(OH)3 cub., Im-3 A Bernalite Fe(OH)3 orth., Immm IMA 1991-032   4.FC.10. Schoenfliesite group   Schoenfliesite MgSn(OH)6 cub., Pn-3 IMA 1968-008 Natanite FeSn(OH)6 cub., Pn-3 FOTO IMA 1980-028 Wickmanite FeSn(OH)6 cub., Pn-3 IMA 1965-024 Mushistonite CuSn(OH)6 cub., Pn-3m FOTO IMA 1982-068 Vismirnovite ZnSn(OH)6 cub., Pn-3m IMA 1980-029 Burtite CaSn(OH)6 cub., Pn-3 IMA 1980-078   4.FC.15. Stottite group   Stottite FeGe(OH)6 tetr., P42/n G Jeanbandyite FeSn(OH)6 tetr., P42/n FOTO IMA 1980-043 Tetrawickmanite MnSn(OH)6 tetr., P42/n FOTO IMA 1971-018 Mopungite NaSb(OH)6 tetr., P42/n FOTO IMA 1982-020   4.FC.20. Nigerite group   Ferronigerite-2N1S (Al,Fe,Zn)2(Al,Sn)6O11(OH) trig., P-3m1 Rn Ferronigerite-6N6S (Al,Fe,Zn)3(Al,Sn,Fe)8O15(OH) trig., R-3m FOTO Rn Magnesionigerite-2N1S (Mg,Al,Zn)2(Al,Sn)6O11(OH) trig., P-3m1 IMA 1988-010, Rn Magnesionigerite-6N6S (Mg,Al,Zn)3(Al,Sn,Fe)8O15(OH) trig., Rn Zinconigerite-2N1S (Zn,Al,Fe)2(Al,Fe)6O11(OH) trig. H Zinconigerite-6N6S (Zn,Al,Fe)3(Al,Fe)8O15(OH) trig., R-3m N Ferronigerite-2N1S, originally described as Nigerite, renamed (2002). Ferronigerite-6N6S, originally described as Nigerite-24R, renamed (2002). Magnesionigerite-2N1S, originally described as Pengzhizhongite-6R, renamed (2002). Magnesionigerite-6N6S, originally described as Pengzhizhongite-24R, renamed (2002).   4.FC.25. Taaffeite group   Magnesiotaaffeite-2N'2S BeMg3Al8O16 hex., P63mc Rn Magnesiotaaffeite-6N'3S BeMg2Al6O12 trig., R-3m IMARn Ferrotaaffeite-2N'3S BeFe3Al8O16 hex., P63mc IMA 2011-025 Ferrotaaffeite-6N'3S BeFe2Al6O12 trig., R-3m Rn Magnesiotaaffeite-2N'2S, originally described as Taaffeite, renamed. Magnesiotaaffeite-6N'3S, originally described as Musgravite, renamed. Ferrotaaffeite-6N'3S, originally described as Pehrmanite, renamed.   4.FD. Hydroxides with OH, without H2O; chains of edge-sharing octahedra   4.FD.05. Spertiniite group   Spertiniite Cu(OH)2 orth., Cmc21 IMA 1980-033   4.FD.10. Diaspore group   Diaspore AlO(OH) . orth., Pbnm G Goethite FeO(OH) . orth., Pbnm A Groutite MnO(OH) . orth., Pbnm G Montroseite VO(OH) . orth., Pbnm FOTO G Bracewellite CrO(OH) . orth., Pbnm IMA 1967-035 Guyanaite CrO(OH) . orth., Pnnm IMA 1967-034 Tsumgallite GaO(OH) . orth., Pbnm IMA 2002-011   4.FD.15. Manganite group   Manganite MnO(OH) mon., B21/d FOTO ENTDECKUNG G   4.FD.20. Yttrotungstite group   Yttrotungstite-(Y) Y(W,Fe,Si,Al)2(O,OH,H2O)9 mon., P21/m FOTO A Yttrotungstite-(Ce) CeW2O6(OH)3 mon., P21/m or P21 IMA 1970-008, Rn   4.FD.25. Frankhawthorneite group   Frankhawthorneite Cu2Te6+O4(OH)2 mon., P21/n IMA 1993-047   4.FD.30. Khinite group   Khinite   (Khinite-4O) Cu3PbTeO4(OH)6 orth., Fddd IMA 1978-035     Khinite-3T Cu3PbTeO6(OH)2 trig., P32 Poly Khinite-3T was originally described as parakhinite (IMA 1978-036), redefined 2009 as a polytype of khinite.   4.FE. Hydroxides with OH, without H2O; sheets of edge-sharing octahedra   4.FE.05. Brucite group   Brucite Mg(OH)2 trig., P-3m1 FOTO G Pyrochroite Mn(OH)2 trig., P-3m1 FOTO G Amakinite Fe(OH)2 trig., P-3m1 A Theophrastite Ni(OH)2 trig., P-3m1 A Portlandite Ca(OH)2 trig., P-3m1 FOTO G Nickel & Nichols (2009) placed fougèrite, [Fe2+6Fe3+2(OH)16][(OH)2 · 4 H2O], in the brucite group, but fougèrite is a LDH with a hydrotalcite-like structure and the Fe2+-Fe3+ analogue of meixnerite and classified here accordingly in the group 4.FL.05.   4.FE.10. Gibbsite group   Gibbsite Al(OH)3 mon., P21/n FOTO A Bayerite Al(OH)3 mon., P21/n G Doyleite Al(OH)3 tric., P-1 IMA 1980-041 Nordstrandite Al(OH)3 tric., I-1 FOTO A   4.FE.15. Böhmite group   Böhmite AlOOH orth., Cmcm G Lepidocrocite  /  Lepidokrokit FeOOH orth., Cmc21 A   4.FE.20. Heterogenite group   Heterogenite   (-3R) CoOOH trig., R-3m FOTO ENTDECKUNG A      Heterogenite-2H CoOOH hex., P63/mmc Poly Grimaldiite CrOOH trig., R-3m IMA 1967-036   4.FE.25. Lithiophorite group   Lithiophorite (Al,Li)Mn4+O2(OH)2 trig., R-3m FOTO ENTDECKUNG G Feitknechtite MnOOH trig., P-3m1 A   4.FE.30. Quenselite group   Quenselite PbMn3+O2(OH) mon., P2/a G   4.FE.35. Ferrihydrite group   Ferrihydrite Fe4 - 5(OH,O)12 hex. FOTO IMA 1971-015   4.FE.40. Feroxyhyte group   Feroxyhyte FeOOH hex. IMA 1975-032 Vernadite (Mn,Fe,Ca,Na)(O,OH)2 · n H2O hex. Q   4.FE.45. Quetzalcoatlite group   Quetzalcoatlite Cu3Zn6Te2O12(OH)6 · (Ag,Pb,□)Cl trig., P-31m FOTO IMA 1973-010   4.FF. Hydroxides with OH, without H2O; various polyhedra   4.FF.05. Hydroromarchite group   Hydroromarchite Sn3O2(OH)2 tetr., P-421c IMA 1969-007   4.FG. Hydroxides with OH, without H2O; unclassified   4.FG.05. Janggunite group   Janggunite (Mn4+,Mn2+,Fe3+>)6O8(OH)6 orth. IMA 1975-011   4.FG.10. Cesàrolite group   Cesàrolite PbMn4+3O6(OH)2 hex. G   4.FG.15. Kimrobinsonite group   Kimrobinsonite Ta(OH)3(O,CO3) cub. IMA 1983-023   4.FH. Hydroxides with H2O +/- (OH); insular octahedra   4.FH.05. Bottinoite group   Bottinoite NiSb2(OH)12 · 6 H2O trig., P3 IMA 1991-029 Brandholzite MgSb2(OH)12 · 6 H2O trig., P3 IMA 1998-017   4.FJ. Hydroxides with H2O +/- (OH); corner-sharing octahedra   4.FJ.05. Sidwillite group   Sidwillite MoO3 · 2 H2O mon., P21/n IMA 1983-089 Meymacite WO3 · 2 H2O amorphous FOTO Rd   4.FJ.10. Tungstite group   Tungstite WO3 · H2O orth., Pmnb FOTO G   4.FJ.15. Hydrotungstite group   Hydrotungstite WO2(OH)2 · H2O mon. G Ilsemannite Mo3O8 · n H2O (?) amorphous FOTO Q   4.FJ.20. Parabariomicrolite group   Parabariomicrolite BaTa4(OH)2O10 · 2 H2O trig., R-3m IMA 1984-003   4.FK. Hydroxides with H2O +/- (OH); chains of edge-sharing octahedra   4.FK.05. Bamfordite group   Bamfordite FeMo2O6(OH)3 · H2O tric., P1 or P-1 IMA 1996-059   4.FL. Hydroxides with H2O +/- (OH); sheets of edge-sharing octahedra   4.FL.05. Meixnerite group   Meixnerite [Mg6Al2(OH)16][(OH)2 · 4 H2O] trig., R-3m FOTO IMA 1974-003 Fougèrite [Fe2+6Fe3+2(OH)16][(OH)2 · 4 H2O] trig., R-3m IMA 2003-057 Iowaite [Mg6Fe2(OH)16][Cl2 · 4 H2O] trig., R-3m IMA 1967-002 Droninoite [Ni6Fe2(OH)8][Cl2 · 4 H2O] trig., R-3m (?) IMA 2008-003 Woodallite [Mg6Cr2(OH)16][Cl2 · 4 H2O] trig., R-3m IMA 2000-042 Jamborite Ni2+1-xNi3+x(OH)2(OH,S0.5) · n H2O (?) hex. IMA 1971-037 Muskoxite Mg7Fe4(OH)26 · H2O (?) trig., R-3m IMA 1967-043 Akdalaite (Al2O3)4-5 · H2O hex., P63mc IMA 1969-002 Note: This group contains minerals with different structures. Meixnerite, fougèrite, iowaite, droninoite, and woodallite are LDH's (layered double hydroxides) with hydrotalcite structure. The Me2+ : Me3+ ratio is not so fixed as indicated by the formulas above. According to the variability in the composition, the formulas should be better given as [Me2+1-xMe3+x(OH)2][(Aniony-)x/y · n H2O] Jamborite has probably a hydrotalcite-like structure, but the composition needs further study. The structure of muskoxite is unknown. Powder diffraction data indicate a relation to the brucite cell. Possibly, muskoxite is a mixed-layer minerals related to coalingite. Akdalaite has a layer structure, but not related to the LDH minerals and should be better placed in a separate group. IMA 2004-051 ("tohdite", discredited) was found to be identical with the earlier described akdalaite.   4.FL.10. Hydrocalumite group   Hydrocalumite [Ca4Al2(OH)12][(Cl,CO3,OH)2-x · 4 H2O] mon., P2/c G   4.FL.15. Kuzelite group   Kuzelite [Ca4Al2(OH)12][(SO4) · 6 H2O] trig., R-3 or R3 FOTO IMA 1996-053   4.FL.20. Chalcophanite group   Chalcophanite ZnMn4+3O7 · 3 H2O trig., R-3 G Ernienickelite NiMn4+3O7 · 3 H2O trig., R-3 or R3 FOTO IMA 1993-002 Aurorite (Mn2+,Ag,Ca)Mn4+3O7 · 3 H2O trig., R-3 or R3 IMA 1966-031 Jianshuiite MgMn4+3O7 · 3 H2O tric., P-1 IMA 1990-019   4.FL.25. Woodruffite group   Woodruffite Zn2Mn5O12 · 4 H2O trig., R-3 G   4.FL.30. Asbolane group   Asbolane MnO2 · (Co,Ni,Mg,Ca)x(OH)2x · n H2O hex., P-3m1 FOTO G   4.FL.35. Buserite group   Buserite Na4Mn14O27 · 21 H2O (?) orth. N (?)   4.FL.40. Takanelite group   Takanelite (Mn2+,Ca)2xMn4+1-xO2 · 0.7 H2O hex. FOTO IMA 1970-034 Ranciéite (Ca,Mn2+)0.2(Mn4+,Mn3+)O2 · 0.6 H2O hex. FOTO G   4.FL.45. Birnessite group   Birnessite (Na,Ca,K)0.6(Mn4+,Mn3+)2O4 · 1.5 H2O mon., C2/m FOTO G   4.FL.50. Chenxianite group   Chenxianite AlMn11O16(OH)9 trig. N   4.FL.55. Cianciulliite group   Cianciulliite Mn(Mg,Mn)2Zn2(OH)10 · 2 - 4 H2O mon., C2/m IMA 1990-042   4.FL.60. Jensenite group   Jensenite Cu3TeO6 · 2 H2O mon., P21/n FOTO IMA 1994-043   4.FL.65. Leisingite group   Leisingite (Cu,Mg,Zn)2(Mg,Fe)TeO6 · 6 H2O trig., P-31m FOTO IMA 1995-011   4.FL.70. group deleted     4.FL.75. Cafetite group   Cafetite CaTi2O5 · H2O orth. A   4.FL.80. Mourite group   Mourite UO2Mo5O16 · 5 H2O mon., P2/a or Pa A   4.FL.85. Deloryite group   Deloryite Cu4UO2Mo2O8(OH)6 mon., C2/m IMA 1990-037   4.FM. Hydroxides with H2O +/- (OH); unclassified octahedra   4.FM.05. group deleted     4.FM.10. Sardignaite group *   Gelosaite * BiMo2+xO7(OH) · H2O mon., P21/m IMA 2009-022 Sardignaite * BiMo2O7(OH) · 2 H2O mon., P21/m IMA 2008-040   4.FM.15. Franconite group   Franconite Na2Nb4O11 · 9 H2O mon. IMA 1981-006 Hochelagaite (Ca,Na,Sr)Nb4O11 · 8 H2O mon. IMA 1983-088 Ternovite (Mg,Ca)Nb4O11 · 8 - 12 H2O mon., P2 or Pm IMA 1992-044   4.FM.20. group deleted     4.FM.25. Belyankinite group   Belyankinite Ca1 - 2(Ti,Zr,Nb)5O12 · 9 H2O (?) (?) FOTO Q Manganbelyankinite (Mn,Ca)(Ti,Nb)5O12 · 9 H2O (?) amorphous Q Gerasimovskite (Mn,Ca)(Nb,Ti)5O12 · 9 H2O amorphous G   4.FM.30. Silhydrite group   Silhydrite Si3O6 · H2O orth. IMA 1970-044   4.FM.35. Cuzticite group   Cuzticite Fe2TeO6 · 9 H2O hex. IMA 1980-071   4.FM.40. Cyanophyllite group   Cyanophyllite Cu5Al2Sb3O12(OH) · 12 H2O orth., Pmmb IMA 1980-065   4.FN. Oxides/Hydroxides with heteropolyanions   4.FM.05. Menezesite group   Menezesite Ba2MgZr4(BaNb12O42) · 12 H2O cub., Im3 IMA 2005-023 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)

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