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MINERAL CLASSIFICATION / SYSTEMATIK der MINERALE

           based on E.H. Nickel & M.C. Nichols (2009), H. Strunz & E.H. Nickel (2001),
           revised by Thomas Witzke (2024)



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.005. Behoite group
 
Behoite Be(OH)2 orth., P212121 FOTO IMA 1969-031
Wülfingite Zn(OH)2 orth., P212121 FOTO IMA 1983-070

Behoite and Wülfingite are isotypic, with topologically identical frameworks of corner-sharing tetrahedra.


 
4.FA.010. Clinobehoite
 
Clinobehoite Be(OH)2 mon., P21 IMA 1988-024


 
4.FA.015. Sweetite
 
Sweetite Zn(OH)2 tetr., P41212 FOTO IMA 1983-011


 
4.FA.020. Ashoverite
 
Ashoverite Zn(OH)2 tetr., P41/amd FOTO IMA 1986-008



 
 
4.FB. Hydroxides with OH, without H2O; insular octahedra
 
4.FB.005. Katoite group [Garnet supergroup]
 
Katoite Ca3Al2(OH)12 cub., Ia3d IMA 1982-080
Xuite Ca3Fe2[AlO3(OH)]3 cub., Ia3d IMA 2018-135a


 
4.FB.010. Saccoite
 
Saccoite Ca2Mn3+2F(OH)8·0.5(SO4) tetr., P4/ncc IMA 2019-056

Saccoite has a tunnel structure with walls built up of Mn(OH)6 octahedra and CaF2(OH)6 polyhedra. Sulfate tetrahedra are situated in the channels parallel c.


 
4.FB.015. Shakhovite
 
Shakhovite Hg4SbO3(OH)3 mon., Im IMA 1980-069



 
 
4.FC. Hydroxides with OH, without H2O; groups and chains of corner-sharing octahedra
 
4.FC.005. Langhofite
 
Langhofite Pb2(OH)[WO4(OH)] tric., P1 IMA 2019-005

Langhofite contains dimers of corner-sharing octahedra, [WO4(OH)]2-groups.



 
 
4.FD. Hydroxides with OH, without H2O; framework of corner-sharing octahedra
 
4.FD.005. Söhngeite group
 
Söhngeite Ga(OH)3 cub., Im3 FOTO IMA 1965-022
Dzhalindite In(OH)3 cub., Im3 A
Bernalite Fe(OH)3 orth., Immm IMA 1991-032


 
4.FD.010. Schoenfliesite group
 
Schoenfliesite MgSn(OH)6 cub., Pn3 IMA 1968-008
Wickmanite MnSn(OH)6 cub., Pn3 IMA 1965-024
Natanite FeSn(OH)6 cub., Pn3 FOTO IMA 1980-028
Mushistonite CuSn(OH)6 cub., Pn3 FOTO IMA 1982-068
Vismirnovite ZnSn(OH)6 cub., Pn3 IMA 1980-029
Burtite CaSn(OH)6 cub., Pn3 IMA 1980-078


 
4.FD.015. 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.FE. Hydroxides with OH, without H2O; groups and chains of edge-sharing octahedra
 
4.FE.005. Spertiniite
 
Spertiniite Cu(OH)2 orth., Cmc21 IMA 1980-033


 
4.FE.010. Diaspore group
 
Diaspore AlO(OH) orth., Pbnm G
Montroseite VO(OH) orth., Pbnm FOTO G
Bracewellite CrO(OH) orth., Pbnm IMA 1967-035
Groutite MnO(OH) orth., Pbnm G
Goethite FeO(OH) orth., Pbnm FOTO A
Guyanaite CrO(OH) orth., Pnnm IMA 1967-034
Tsumgallite GaO(OH) orth., Pbnm IMA 2002-011


 
4.FE.015. Manganite
 
Manganite MnO(OH) mon., B21/d FOTO G


 
4.FE.020. 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
Yttrotungstite-(Nd) NdW2O6(OH)3 mon., P21/m IMA 2023-064



 
 
4.FF. Hydroxides with OH, without H2O; sheets of edge-sharing octahedra
 
4.FF.005. Brucite group
 
Brucite Mg(OH)2 trig., P3m1 FOTO G
Pyrochroite Mn(OH)2 trig., P3m1 FOTO G
Amakinite Fe(OH)2 trig., P3m1 A
Theophrastite Ni(OH)2 trig., P3m1 A
Portlandite Ca(OH)2 trig., P3m1 FOTO G


 
4.FF.010. Gibbsite group
 
Gibbsite Al(OH)3 mon., P21/n FOTO A
Bayerite Al(OH)3 mon., P21/n G
Doyleite Al(OH)3 tric., P1 IMA 1980-041
Nordstrandite Al(OH)3 tric., I1 FOTO A


 
4.FF.015. Böhmite group
 
Böhmite AlOOH orth., Cmcm G
Lepidocrocite FeOOH orth., Cmc21 FOTO A


 
4.FF.020. Heterogenite group
 
Heterogenite CoOOH trig., R3m FOTO A
Grimaldiite CrOOH trig., R3m IMA 1967-036

Heterogenite polytypes: Heterogenite-3R (trig., R3m), Heterogenite-2H (hex., P63/mmc)


 
4.FF.025. Feitknechtite
 
Feitknechtite MnOOH trig., P3m1 A


 
4.FF.030. Cualstibite group [Hydrotalcite supergroup]
 
Cualstibite [Cu2Al(OH)6][Sb5+(OH)6] trig., P3 IMA 1983-068
Zincalstibite [Zn2Al(OH)6][Sb5+(OH)6] trig., P3 IMA 1998-033
Omsite [Ni2Fe(OH)6][Sb5+(OH)6] trig., P3 IMA 2012-025

Cualstibite polytypes: Cualstibite-1T (trig., P3), Cualstibite-1M (mon., P21/c, originally described as Cyanophyllite).


 
4.FF.035. Lithiophorite
 
Lithiophorite [(Al,Li)(OH)2][Mn4+O2] trig., R3m FOTO G


 
4.FF.040. Quenselite
 
Quenselite PbMn3+O2(OH) mon., P2/a G


 
4.FF.045. Akdalaite group
 
Akdalaite Al10O14(OH)2 hex., P63mc IMA 1969-002
Ferrihydrite Fe10O14(OH)2 hex. FOTO IMA 1971-015

Akdalait: new formula and structure determination, isotypic with the nanomineral ferrihydrite (Parise et al., 2019, Crystals 9, 246).


 
4.FF.050. Feroxyhyte
 
Feroxyhyte FeOOH hex. IMA 1975-032


 
4.FF.055. Tashelgite
 
Tashelgite CaMgFe2+Al9O16(OH) mon., Pc IMA 2010-017



 
 
4.FG. Hydroxides with OH, without H2O; various polyhedra
 
4.FG.005. Hydroromarchite
 
Hydroromarchite Sn3O2(OH)2 tetr., P421c IMA 1969-007


 
4.FH. Hydroxides with OH, without H2O; unclassified
 
4.FH.005. Janggunite
 
Janggunite (Mn4+,Mn2+,Fe3+)6O8(OH)6 orth. IMA 1975-011


 
4.FH.010. Cesàrolite
 
Cesàrolite PbMn4+3O6(OH)2 hex. G


 
4.FH.015. Kimrobinsonite
 
Kimrobinsonite Ta(OH)3(O,CO3) cub. IMA 1983-023



 
 
4.FJ. Hydroxides with H2O +/- (OH); insular octahedra
 
4.FJ.005. Qatranaite
 
Qatranaite CaZn2(OH)6·2H2O mon., P21/c IMA 2016-024


 
4.FJ.010. Bottinoite group
 
Brandholzite MgSb2(OH)12·6H2O trig., P3 IMA 1998-017
Bottinoite NiSb2(OH)12·6H2O trig., P3 IMA 1991-029



 
 
4.FK. Hydroxides with H2O +/- (OH); corner-sharing octahedra (and chemically related amorphous minerals)
 
4.FK.005. Tungstite
 
Tungstite WO3·H2O orth., Pmnb FOTO G


 
4.FK.010. Hydrotungstite
 
Hydrotungstite WO2(OH)2·H2O mon. G


 
4.FK.015. Meymacite
 
Meymacite WO3·2H2O amorphous FOTO Rd


 
4.FK.020. Virgilluethite
 
Virgilluethite MoO3·H2O mon., P21/c IMA 2023-006

Virgilluethite: Layers of edge-sharing octahedra.


 
4.FK.025. Sidwillite
 
Sidwillite MoO3·2H2O mon., P21/n IMA 1983-089

Sidwillite: Layers of edge-sharing octahedra.


 
4.FK.030. Ilsemannite
 
Ilsemannite Mo3O8·nH2O (?) amorphous FOTO Q


 
4.FK.035. Kingsgateite
 
Kingsgateite ZrMo2O7(OH)2·2H2O mon., P21/m IMA 2008-040



 
 
4.FL. Hydroxides with H2O +/- (OH); chains of edge-sharing octahedra; clusters of octahedra connected to stepped layers
 
4.FL.005. Bamfordite
 
Bamfordite FeMo2O6(OH)3·H2O tric., P1 or P1 IMA 1996-059

Bamfordite contains clusters of Mo centered octahedra connected via Fe centered octahedra to stepped layers.


 
4.FL.010. Anthoinite group
 
Anthoinite AlWO3(OH)3 tric., I1 G
Mpororoite AlWO3(OH)3·1.5H2O mon. or tric. IMA 1970-037

Anthoinite contains clusters of W centered octahedra connected via Al centered octahedra to stepped layers.


 
4.FL.015. Tianhuixinite
 
Tianhuixinite (MoO3)3·H2O hex., P63/m IMA 2022-081

Tianhuixinite: zig-zag chains of edge-sharing MoO6 octahedra.


 
4.FL.020. Zhenruite
 
Zhenruite (MoO3)2·H2O mon., P21/m IMA 2022-050

Two zig-zag chains of distorted edge-sharing MoO6 and MoO5(H2O) octahedra.


 
4.FL.025. Raydemarkite
 
Raydemarkite MoO3·H2O tric., P1 IMA 2022-015

Zig-zag chains of edge-sharing octahedra.


 
4.FL.030. Gelosaite
 
Mambertiite BiMo2.80O8(OH) tric., P1 IMA 2013-098
Gelosaite BiMo6+2-5xMo5+6xO7(OH)·H2O (0 ≤ x ≤ 0.4) mon., P21/m IMA 2009-022

Zig-zag chains of edge- and corner-sharing octahedra.


 
4.FL.035. Sardignaite
 
Sardignaite BiMo2O7(OH)·2H2O mon., P21/m IMA 2008-040


 
4.FL.040. Ootannite
 
Ootannite Th4+2W6+4O16·5H2O mon., P21/c IMA 2023-039



 
 
4.FM. Hydroxides with H2O +/- (OH); sheets of edge-sharing octahedra
 
4.FM.005. Hydrotalcite group (7.5 Å Layered Double Hydroxides, 1 metal-hydroxide layer : 1 anion-water layer, M2+ : M3+ = 3 : 1) [Hydrotalcite supergroup]
 
Meixnerite [Mg6Al2(OH)16][(OH)2(H2O)4] trig., R3m FOTO IMA 1974-003
Iowaite [Mg6Fe2(OH)16][Cl2(H2O)4] trig., R3m IMA 1967-002
Droninoite [Ni6Fe2(OH)16][Cl2(H2O)4]] trig., R3m IMA 2008-003
Woodallite [Mg6Cr2(OH)16][Cl2(H2O)4] trig., R3m IMA 2000-042
Hydrotalcite [Mg6Al2(OH)16][(CO3)(H2O)4] trig., R3m A
Takovite [Ni6Al2(OH)16][(CO3)(H2O)4] trig. A
Desautelsite [Mg6Mn2(OH)16][(CO3)(H2O)4] trig., R3m IMA 1978-016
Pyroaurite [Mg6Fe2(OH)16][(CO3)(H2O)4] trig., R3m FOTO Rd
Reevesite [Ni6Fe2(OH)16][(CO3)(H2O)4] trig. IMA 1966-025
Kaznakhtite [Ni6Co2(OH)16][(CO3)(H2O)4] trig., R3m IMA 1921-056
Stichtite [Mg6Cr2(OH)16][(CO3)(H2O)4] trig., R3m FOTO Rd

Hydrotalcite polytypes: Hydrotalcite-3R (trig., R3m), Hydrotalcite-2H (hex., P63/mmc, originally described as Manasseite).
Pyroaurite polytypes: Pyroaurite-3R (trig., R3m), Pyroaurite-2H (hex., P63/mmc, originally described as Sjögrenite).
Stichtite polytypes: Stichtite-3R (trig., R3m), Stichtite-2H (hex., P63/mmc, originally described as Barbertonite).


 
4.FM.010. Quintinite group (7.5 Å Layered Double Hydroxides, M2+ : M3+ = 2 : 1) [Hydrotalcite supergroup]
 
Chlormagaluminite [Mg4Al2(OH)12][Cl2(H2O)3] hex. IMA 1980-098
Quintinite [Mg4Al2(OH)12][(CO3)(H2O)3] hex., P6322 FOTO IMA 1992-028
Charmarite [Mn4Al2(OH)12][(CO3)(H2O)3] hex., P6322 IMA 1992-026
Caresite [Fe4Al2(OH)12][(CO3)(H2O)3] hex., P6322 FOTO IMA 1992-030
Zaccagnaite [Zn4Al2(OH)12][(CO3)(H2O)3] hex., P63/mmc FOTO IMA 1997-019
Comblainite [Ni4Co2(OH)12][(CO3)(H2O)3] trig. IMA 1978-009
Liudongshengite [Zn4Cr2(OH)12][(CO3)(H2O)3] trig., R3m IMA 2019-044

Quintinite polytypes: Quintinite-3T (trig., P3112 or P3212), Quintinite-2H (hex., P6322, originally described as a separate mineral, IMA 1992-029), Quintinite-1M (mon., C2/m).
Charmarite polytypes: Charmarite-3T (trig., P3112 or P3212), Charmarite-2H (hex., P6322, originally described as a separate mineral, IMA 1992-027).
Zaccagnaite polytypes: Zaccagnaite-3R (trig., R3m), Zaccagnaite-2H (hex., P63/mmc).


 
4.FM.015. Akopovaite group (7.5 Å Layered Double Hydroxides, M3+ : M1+ = 2 : 1) [Hydrotalcite supergroup]
 
Akopovaite [Al4Li2(OH)12][(CO3)(H2O)3] mon., C2/m IMA 2018-095
Dritsite [Al4Li2(OH)12][Cl2(H2O)3] hex., P63/mcm IMA 2019-017


 
4.FM.020. Fougèrite group (7.5 Å Layered Double Hydroxides) [Hydrotalcite supergroup]
 
Fougèrite [Fe2+4Fe3+2(OH)12][(CO3)(H2O)3] trig. IMA 2003-057, Rd
Trébeurdenite [Fe2+2Fe3+4(OH)10O2][(CO3)(H2O)3] trig. FOTO A
Mössbauerite [Fe3+6(OH)8O4][(CO3)(H2O)3] trig. FOTO IMA 2012-049


 
4.FM.025. Woodwardite group (8.5 - 9 Å Layered Double Hydroxides) [Hydrotalcite supergroup]
 
Woodwardite [Cu1-XAlX(OH)2][(SO4)X/2(H2O)n] trig., R3m FOTO G
Zincowoodwardite [Zn1-XAlX(OH)2][(SO4)X/2(H2O)n] trig., R3m FOTO IMA 1998-026
Honessite [Ni1-XFeX(OH)2][(SO4)X/2(H2O)n] trig., R3m A

For all minerals of the group: x < 0.5, n < 3x/2.
Zincowoodwardite polytypes: Zincowoodwardite-3R (trig., R3m), Zincowoodwardite-1T (trig., P3).


 
4.FM.030. Glaucocerinite group (11 Å Layered Double Hydroxides) [Hydrotalcite supergroup]
 
Carrboydite [Ni1-XAlX(OH)2][(SO4)X/2(H2O)n] hex. IMA 1974-033, Q
Hydrowoodwardite [Cu1-XAlX(OH)2][(SO4)X/2(H2O)n] trig., R3m FOTO IMA 1996-038
Glaucocerinite [Zn1-XAlX(OH)2][(SO4)X/2(H2O)n] trig., R3m G
Mountkeithite [Mg1-XFeX(OH)2][(SO4)X/2(H2O)n] trig., R3m FOTO IMA 1980-038
Hydrohonessite [Ni1-XFeX(OH)2][(SO4)X/2(H2O)n] hex. IMA 1980-037a

For all minerals of the group: x < 0.5, n > 3x/2


 
4.FM.035. Wermlandite group (11 Å Layered Double Hydroxides, with additional interlayer cations) [Hydrotalcite supergroup]
 
Motukoreaite [Mg6Al3(OH)18][(SO4)2Na(H2O)6(H2O)6] trig., R3m FOTO IMA 1976-033, Q
Shigaite [Mn6Al3(OH)18][(SO4)2Na(H2O)6(H2O)6] trig. IMA 1984-057
Nikischerite [Fe6Al3(OH)18][(SO4)2Na(H2O)6(H2O)6] trig. FOTO IMA 2001-039
Natroglaucocerinite [Zn6Al3(OH)18][(SO4)2Na(H2O)6(H2O)6] trig. IMA 1995-025, Q
Wermlandite [Mg7Al2(OH)18][(SO4)2Ca(H2O)6(H2O)6] trig. IMA 1970-007
Erssonite [Mg7Fe3+2(OH)18][(SO4)2Ca(H2O)6(H2O)6] trig., P3c1 IMA 2021-016
Karchevskyite Mg18Al9(OH)54Sr2(CO3)9(H2O)6(H3O)5 trig. IMA 2005-015a

Motukoreaite represents probably more than one species, there are samples with CO3 > SO4 known.


 
4.FM.040. Coalingite (12 Å Layered Double Hydroxides, 2 metal-hydroxide layers : 1 anion-water layer) [Hydrotalcite supergroup]
 
Coalingite [Mg10Fe3+2(OH)24][(CO3)(H2O)2] trig., R3m IMA 1965-011


 
4.FM.045. Brugnatelite - Muscoxite (Layered Double Hydroxides) [Hydrotalcite supergroup]
 
Brugnatellite Mg6Fe3+(OH)13(CO3)(H2O)4 hex. Q
Muskoxite Mg7Fe3+4(OH)26(H2O) (?) trig. IMA 1967-043, Q

Brugnatellite is perhaps a variety of Pyroaurite.
Muscoxite needs further study and may represent more than one species.


 
4.FM.050. Hydrocalumite group (Layered Double Hydroxides with Ca, 1 metal-hydroxide layer : 1 anion-water layer) [Hydrotalcite supergroup]
 
Hydrocalumite [Ca4Al2(OH)12][(Cl,CO3,OH)2-x(H2O)4] mon., P2/c G
Carbocalumite [Ca4Al2(OH)12][(CO3)(H2O)6] trig., R3c IMA 2021-106
Mampsisit [Ca4Al2(OH)12][(CO3)(H2O)5] tric., P1 IMA 2023-090
Kuzelite [Ca4Al2(OH)12][(SO4)(H2O)6] trig., R3 or R3 FOTO IMA 1996-053
Poellmannite [Ca6Al3(OH)18][(SO4)2Na(H2O)6(H2O)6] trig., R3 IMA 2021-109


 
4.FM.055. Jamborite
 
Jamborite Ni2+1-xCo3+x(OH)2-x(SO4)x·nH2O trig., R3m IMA 1971-037

In the formula is X < 1/3 (probably < 1/7), and n < 1-x. Jamborite was originally described as containing sulfide and as a possible member of the hydrotalcite group, but a recent study showed that sulfate is present. The structure contains brucite-like hydroxide layers, but sulfate oxygen probably replaces a part of the OH from the brucite layer. Jamborite is related to the hydrotalcite supergroup, but also to minerals like mooreite and others.


 
4.FM.060. Georgeite
 
Georgeite [Cu(OH)2-x(H2O)x][CO3]x/2 amorphous IMA 1977-004, Rd

Georgeite: originally described as amorphous Cu2(CO3)(OH)2. Redefined as an amorphous alpha-phase hydroxide (IMA 23-G).


 
4.FM.065. Chalcophanite group
 
Ernienickelite NiMn4+3O7·3H2O trig., R3 or R3 FOTO G
Chalcophanite ZnMn4+3O7·3H2O trig., R3 IMA 1993-002
Aurorite Mn2+Mn4+3O7·3H2O trig., R3 or R3 IMA 1966-031
Jianshuiite MgMn4+3O7·3H2O tric., P1 IMA 1990-019


 
4.FM.070. Woodruffite
 
Woodruffite Zn2Mn5O12·4H2O trig., R3 G


 
4.FM.075. Asbolane
 
Asbolane MnO2·(Co,Ni,Mg,Ca)x(OH)2x·nH2O hex., P3m1 FOTO G


 
4.FM.080. Ranciéite group (7 Å Phyllomanganates)
 
     080 a. Ranciéite series
Ranciéite (Ca,Mn2+)0.2(Mn4+,Mn3+)O2·0.6H2O hex. FOTO G
Takanelite (Mn2+,Ca)2xMn4+1-xO2·0.7H2O hex. FOTO IMA 1970-034
 
     080 b. Birnessite
Birnessite (Na,Ca,K)0.6(Mn4+,Mn3+)O2·1.5H2O mon., C2/m FOTO G
 
     080 Appendix. Vernadite
Vernadite (Mn,Fe,Ca,Na)(O,OH)2·nH2O hex. Q

Vernadite is probably a nanocrystalline phyllomanganate with Ranciéite structure.


 
4.FM.085. Buserite group (10 Å Phyllomanganates)
 
     085 a. Lagalyite
Lagalyite Ca2XMn4+1-XO2·1.5-2H2O (X ca. 0.1 - 0.12) mon. FOTO IMA 2016-106
 
     085 b. Buserite
Buserite NaX(Mn4+1-XMn3+X)O2·nH2O (?) orth. FOTO IMA 1970-024


 
4.FM.090. Cianciulliite
 
Cianciulliite Mn(Mg,Mn)2Zn2(OH)10·2-4H2O mon., C2/m IMA 1990-042


 
4.FM.095. Franconite group
 
Franconite NaNb2O5(OH)·3H2O mon., P21/c IMA 1981-006
Ternovite (Mg,Ca)Nb4O11·8-12H2O mon., P2 or Pm IMA 1992-044
Hochelagaite (Ca,Na,Sr)Nb4O11·8H2O mon. FOTO IMA 1983-088
Charleshatchettite CaNb4O10(OH)2·8H2O mon., C2/c IMA 2015-048

The structure of franconite contains clusters of four edge-sharing Nb(O,OH)6 octahedra, linked through shared corners to adjacent clusters, forming layers of Nb(O,OH)6 octahedra. These alternate along [100] with layers composed of NaO(H6O)4 polyhedra (Haring & McDonald, 2014).


 
4.FM.100. Cafetite
 
Cafetite CaTi2O5·H2O orth. A



 
 
4.FN. Hydroxides with H2O +/- (OH); three-dimensional framework of edge- and corner-sharing octahedra
 
4.FN.005. Cadwaladerite
 
Cadwaladerite Al5(H2O)3(OH)12·n(Cl,H2O) cub., Im3m FOTO Rd
 
     Appendix
unnamed Al5(OH)12Cl3·7.5H2O trig. FOTO -

Lesukite, IMA 1996-004, was found to be identical with Cadwaladerite, and was discredited in 2019.
Unnamed Al5(OH)12Cl3· 7.5H2O is not accepted yet as a mineral.



 
 
4.FO. Hydroxides with H2O +/- (OH); with polyoxometalate anions
 
4.FO.005. Peterandresenite
 
Peterandresenite Mn4[Nb6O19]·14H2O mon., C2/m IMA 2012-084


 
4.FO.010. Hansesmarkite
 
Hansesmarkite Ca2Mn2[Nb6O19]·20H2O tric., P1 IMA 2015-067


 
4.FO.015. Melcherite
 
Melcherite Ba2Na2Mg[Nb6O19]·6H2O trig., R3 IMA 2015-018


 
4.FO.020. Menezesite group (heteropolyniobates)
 
Menezesite Ba2MgZr4[BaNb12O42]·12H2O cub., Im3 IMA 2005-023
Aspedamite □12(Fe3+,Fe2+)3Nb4[Th(Nb,Fe)12O42](H2O,OH)12 cub., Im3 IMA 2011-056



 
 
4.FP. Hydroxides with H2O +/- (OH); unclassified
 
4.FP.005. Belyankinite group
 
Gerasimovskite (Mn,Ca)(Nb,Ti)5O12·9H2O amorphous G
Belyankinite Ca1 - 2(Ti,Zr,Nb)5O12·9H2O (?) FOTO Q
Manganbelyankinite (Mn,Ca)(Ti,Nb)5O12·9H2O amorphous Q


 
4.FP.010. Silhydrite
 
Silhydrite Si3O6·H2O orth. IMA 1970-044



 
 

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 (2024)


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