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FOTO ATLAS
SYSTEMATIK


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.D: Metal : Oxygen = 1 : 2 and similar


4.DA. With cations only in tetrahedral coordination (Silica family)
 
4.DA.005. Quartz group
 
Quartz  /  Quarz SiO2 trig., P3121, P3221 FOTO A
Pertoldite GeO2 trig., P3121, P3221 IMA 2021-074

High-quartz (β-quartz), hex., P6222 and P6422, is stable only above 573°C and is not described as a mineral.


 
4.DA.010. Tridymite
 
Tridymite SiO2 orth., C2221 FOTO G

High-temperature β-tridymite is hexagonal, P63/mmc.


 
4.DA.015. Cristobalite
 
Cristobalite SiO2 tetr., P41212, P43212 FOTO G

High-temperature β-cristobalite is cubic, Fd3m.


 
4.DA.020. Mogánite
 
Mogánite SiO2 mon., I2/a FOTO IMA 1999-035


 
4.DA.025. Coesite
 
Coesite SiO2 mon., C2/c FOTO A


 
4.DA.027. Keatite
 
Keatite SiO2 tetr., P43212 -

Keatite is known as a synthetic compound and was found also in the Kokchetav Massif, Kazakhstan, but is not described as a mineral.


 
4.DA.030. Lechatelierite
 
Lechatelierite SiO2 amorphous Q


 
4.DA.035. Opal
 
Opal SiO2·nH2O amorphous FOTO G


 
4.DA.040. Melanophlogite group (clathrate structures)
 
Melanophlogite 46 SiO2·C2H17O5 tetr., P42/nbc FOTO Rd
Chibaite SiO2·n(CH4,C2H6,C3H8,C4H10)   (n < 3/17) cub., Fd3 IMA 2008-067
Bosoite SiO2·nCXH2X+2   (n ca. 0.5, X mainly 1 and 2) hex., P6/mmm IMA 2014-023

Melanophlogite, Chibaite and Bosoite are clathrate structures (clathrasils). Above ca. 40°C, melanophlogite is cubic, Pm3n, and isostructural with the cubic gas hydrates (group 4.AA.005).



 
 
4.DB. With cations in tetrahedral + other polyhedral coordination
 
4.DB.005. Bahariyaite
 
Bahariyaite KMnO4 orth., Pnma IMA 2020-022

Bahariyaite is a potassium permanganate with Mn7+ in tetrahedral coordination and isostructural with baryte. K is coordinated to 8 oxygen of the surrounding MnO4 tetrahedra.


 
4.DB.010. Clinofergusonite group
 
Clinofergusonite-(Y) YNbO4 mon., C2/c (I2/a) FOTO A
Clinofergusonite-(Ce) CeNbO4 mon., C2/c A
Clinofergusonite-(Nd) NdNbO4 mon., C2/c IMA 1992-047
Takanawaite-(Y) YTaO4 metamict; mon., I2/a IMA 2011-099

Clinofergusonites: NbO4 tetrahedra and NdO7 polyhedra.
Clinofergusonite-(Y) etc., renamed (2022), originally described as Fergusonite-(Y)-β, etc.



 
 
4.DC. With straight chains of edge-sharing M[6] octahedra
 
4.DC.005. Rutile group
 
Stishovite SiO2 tetr., P42mnm A
Rutile TiO2 tetr., P42/mnm FOTO G
Pyrolusite MnO2 tetr., P42/mnm A
Argutite GeO2 tetr., P42/mnm IMA 1980-067
Cassiterite SnO2 tetr., P42/mnm FOTO G
Varlamoffite (Sn,Fe)(O,OH)2 tetr., P42/mnm Q
Plattnerite PbO2 tetr., P42/mnm FOTO G
Tripuhyite FeSbO4 tetr., P42/mnm FOTO Rd

Structure of the rutile group minerals: The structure is built up of straight chains of edge-sharing octahedra. These chains are connected to neighboring chains by sharing corners of the octahedra, forming 1 x 1 octahedra wide "tunnels".
Varlamoffite is possibly a ferroan, hydroxylian cassiterite.


 
4.DC.010. Tugarinovite
 
Tugarinovite MoO2 mon., P21/c IMA 1979-072

Tugarinovite has a monoclinic distorted rutile structure.


 
4.DC.015. Tapiolite group
 
     015 a. Trirutile structure A2+B5+2O6
Tapiolite-(Mn) MnTa2O6 tetr., P42/mnm IMA 1983-005, Rn
Tapiolite-(Fe) FeTa2O6 tetr., P42/mnm FOTO Rn
Byströmite MgSb2O6 tetr., P42/mnm G
Tredouxite NiSb2O6 tetr., P42/mnm IMA 2017-061
Ordoñezite ZnSb2O6 tetr., P42/mnm G
 
     015 b. Inverse trirutile structure A3+2B6+O6
Andymcdonaldite Fe3+2Te6+O6 tetr., P42/mnm IMA 2018-141

Tapiolite-(Mn), renamed 2008, originally described as "Manganotapiolite". There are some doubts about the natural occurrence of Tapiolite-(Mn).
Tapiolite-(Fe), renamed 2008, originally described as "Ferrotapiolite".


 
4.DC.020. Wildcatite
 
Wildcatite CaFe3+Te6+O5(OH) trig., P31m IMA 2020-019

The structure of wildcatite is related to the trirutile structure.


 
4.DC.025. Nsutite
 
Nsutite Mn2+xMn4+1-xO2-2x(OH)2x hex. FOTO A

Nsutite: Double-chains of straight edge-sharing octahedra and single chains of straight edge-sharing octahedra. The two types of chains are connected by sharing corners of the octahedra, forming 1 x 1 and 1 x 2 octahedra wide "tunnels". The structure can be described as an derivative of the rutile structure, by replacing half of the single chains by double chains.


 
4.DC.030. Ramsdellite group
 
Ramsdellite MnO2 orth., Pbnm G
Paramontroseite VO2 orth., Pbnm G

Ramsdellite group: Double-chains of straight edge-sharing octahedra, connected by sharing corners of the next double chains, forming 1 x 2 octahedra wide "tunnels". The structure can be described as an derivative of the rutile structure, by replacing the single chains by double chains.



 
 
4.DD. With zig-zag chains of edge-sharing M[6] octahedra
 
4.DD.005. Ixiolite group [Columbite supergroup]
 
Seifertite SiO2 orth., Pbcn IMA 2004-010
Srilankite TiO2 orth., Pbcn IMA 1982-056, Rd
Scrutinyite PbO2 orth., Pbcn IMA 1984-061
Nioboixiolite-(□) (Nb0.8□0.2)O2 orth., Pbcn IMA 2021-002a
Nioboixiolite-(Mn2+) (Nb2/3Mn1/3)O2 orth., Pbcn IMA 2021-050a
Ixiolite-(Mn2+) (Ta2/3Mn1/3)O2 orth., Pbcn Rd
Ixiolite-(Fe2+) (Ta2/3Fe1/3)O2 orth., Pbcn Rd
 
     Appendix: Qitianlingite
Qitianlingite (Fe,Mn)2(Nb,Ta)2WO10 orth., Pbcn IMA 1983-074, Q

Ixiolite, Scrutinyite etc.: Archetype structure of the Columbite group, with disordered cation distribution.
Seifertite is a high-pressure polymorph of SiO2 with α-PbO2 structure.
Qitianlingite has very probably not an ordered cation distribution, but is probably the Nb-Fe analogue of Ixiolite-(Mn).


 
4.DD.010. Wolframite group [Columbite supergroup]
 
Huanzalait MgWO4 mon., P2/c IMA 2009-018
Hübnerite MnWO4 mon., P2/c FOTO G
Ferberite FeWO4 mon., P2/c FOTO G
Sanmartinite ZnWO4 mon., P2/c A
Nioboheftetjernite ScNbO4 mon., P2/c IMA 2019-133
Heftetjernite ScTaO4 mon., P2/c IMA 2006-056
Rossovskyite Fe3+NbO4 mon., P2/c IMA 2014-056
Riesite TiTiO4 mon., P2/c IMA 2015-110a
Dmitryvarlamovite Ti2(Fe3+Nb)O8 orth., P21212 IMA 2022-125a

Wolframite group: monoclinic distorted ixiolite structure, with ordered cation distribution.
Dmitryvarlamovite shows a slighty different cation ordering scheme compared to the other members of the wolframite group.


 
4.DD.015. Samarskite group (cations ordered, ABO4 and related) [Columbite supergroup]
 
Samarskite-(Y) YFe3+Nb2O8 mon., P2/c FOTO Rd IMA 2019-J
Shakhdaraite-(Y) YScNb2O8 mon., P2/c IMA 2020-024
Ekebergite ThFe2+Nb2O8 mon., P2/c IMA 2018-088
Samarskite-(Yb) YbFe3+Nb2O8 (?) mon., P2/c IMA 2004-001, Q
Ishikawaite U2+Fe2+Nb2O8 (?) mon. G, Q
Calciosamarskite CaFe3+Nb2O7(OH) (?) mon. G, Q


 
4.DD.020. Columbite group [Columbite supergroup]
 
Columbite-(Mg) MgNb2O6 orth., Pbcn Rn
Columbite-(Mn) MnNb2O6 orth., Pbcn FOTO Rn
Columbite-(Fe) FeNb2O6 orth., Pbcn FOTO Rn
Tantalite-(Mg) MgTa2O6 orth., Pbcn IMA 2002-018, Rn
Tantalite-(Mn) MnTa2O6 orth., Pbcn FOTO Rn
Tantalite-(Fe) FeTa2O6 orth., Pbcn Rn
Fersmite CaNb2O6 orth., Pbcn FOTO A
Euxenite-(Y) Y(NbTi)O6 metam. / orth., Pbcn FOTO A, Rd
Tanteuxenite-(Y) Y(TaTi)O6 metam. / orth., Pbcn A, Rd
Uranopolycrase UTi2O6 metam. / orth., Pbcn FOTO IMA 1990-046

Columbite-(Mg) was originally described as "Magnocolumbite", renamed (2008).
Columbite-(Mn) was originally described as "Manganocolumbite", renamed (2008).
Columbite-(Fe) was originally described as "Ferrocolumbite", renamed (2008).
Tantalite-(Mg) was originally described as "Magnesiotantalite", renamed (2008).
Tantalite-(Mn) was originally described as "Manganotantalite", renamed (2008).
Tantalite-(Fe) was originally described as "Ferrotantalite", renamed (2008).
Polycrase-(Y), discredited (2022), is identical to Euxenite-(Y)


 
4.DD.025. Wodginite group [Columbite supergroup]
 
Achalaite Fe2+TiNb2O8 mon., C2/c IMA 2013-103
Titanowodginite MnTiTa2O8 mon., C2/c FOTO IMA 1984-008
Ferrotitanowodginite FeTiTa2O8 mon., C2/c IMA 1998-028
Wodginite MnSnTa2O8 mon., C2/c A
Ferrowodginite FeSnTa2O8 mon., C2/c IMA 1984-006
Tantalowodginite (Mn,□)TaTa2O8 mon., C2/c IMA 2017-095
Lithiowodginite LiTaTa2O8 mon., C2/c IMA 1988-011


 
4.DD.030. Lithiotantite [Columbite supergroup]
 
Lithiotantite LiTa3O8 mon., P21/c IMA 1982-022



 
 
4.DE. With dimers and trimers of edge-sharing M[6] octahedra, connected to chains
 
4.DE.005. Aeschynite group
 
Aeschynite-(Y) (Y,Ca,Fe,Th)(Ti,Nb)2(O,OH)6 orth., Pbnm FOTO Rn
Aeschynite-(Ce) (Ce,Ca,Fe,Th)(Ti,Nb)2(O,OH)6 orth., Pbnm Rn
Aeschynite-(Nd) (Nd,REE,Ca)(Ti,Nb)2(O,OH)6 orth., Pbnm A
Nioboaeschynite-(Y) (Y,Ce,...)(Nb,Ti,Ta)2(O,OH)6 orth., Pbnm IMA 2003-038a
Nioboaeschynite-(Ce) (Ce,Ca)(Nb,Ti)2(O,OH)6 orth., Pbnm Rn
Tantalaeschynite-(Y) (Y,Ce)(Ta,Ti,Nb)2(O,OH)6 orth., Pbnm IMA 1969-043, Rn
Vigezzite (Ca,Ce)(Nb,Ta,Ti)2(O,OH)6 orth., Pbnm IMA 1977-008
Rynersonite Ca(Ta,Nb)2(O,OH)6 orth., Pbnm IMA 1974-058

Aeschynite and related minerals: dimers of corner-sharing TiO6 octahedra, connected to the next dimer by sharing corners of the octahedra, forming double chains. These double chains are connected to the neighboring double chains by sharing corners of the octahedra.



 
 
4.DF. With groups and bands of edge-sharing M[6] octahedra, forming layer-like structures
 
4.DF.005. Alumotantite
 
Alumotantite AlTaO4 orth., Pbcn IMA 1980-025

Alumotantite: Zig-zag chains of edge-sharing AlO6 octahedra, each AlO6 octahedron shares edges with an TaO6 octahedron as an "extension" of the zig-zag chain, forming bands. These bands are arranged in layers. The octahedra share corners with the octahedra of the next layer so that each occupied octahedron is immediately overlain and underlain by an unoccupied one (Ercit et al., 1992).


 
4.DF.010. Simpsonite
 
Simpsonite Al4(Ta,Nb)3O13(OH) trig., P3 FOTO G

Simpsonite: Groups of three edge-sharing TaO6 octahedra in a layer, alternating with layers of groups of three edge-sharing AlO6 octahedra. The octahedra share corners with the octahedra of the next layer so that each occupied octahedron is immediately overlain and underlain by an unoccupied one (Ercit et al., 1992).


 
4.DF.015. Bahianite
 
Bahianite Al5Sb3O14(OH)2 mon., C2/m FOTO IMA 1974-027


 
4.DF.020. Pseudorutile group
 
Pseudorutile [Ti4+4][(Fe3+,Ti4+)4](O,OH)16 hex., P6322 Rd
Kleberite [Ti4+3□][Ti4+3Fe3+]O11(OH)5 mon., P21/c FOTO IMA 2012-023
Tivanite [Ti4+4][V3+4]O12(OH)4 mon., P21/c IMA 1980-035
Tianhongqiite [Ti4+4][Cr3+4]O12(OH)4 mon., P21/n IMA 2021-006b

Kleberite: bands of edge-sharing octahedra arranged in layers, connected to the next layer of bands by sharing corners of the octahedra (Grey et al., 2013).


 
4.DF.025. Carmichaelite
 
Carmichaelite (Ti,Cr,Fe)(O,OH)2 mon., P21/c IMA 1996-062



 
 
4.DG. Three-dimensional frameworks of edge-sharing M[6] octahedra
 
4.DG.005. Anatase
 
Anatase TiO2 tetr., I41/amd FOTO A


 
4.DG.010. Brookite
 
Brookite TiO2 orth., Pbca FOTO G



 
 
4.DH. With chains of edge-sharing M[6] octahedra + cations in other coordination
 
4.DH.005. Biehlite
 
Biehlite Sb2MoO6 mon., C2/c FOTO IMA 1999-019a

Biehlite: Zig-zag chains of edge-sharing, strongly distorted [MoO6]6- octahedra which run parallel to the c direction. The octahedra are flanked by a [Sb2O2]6- group on each side and infinite ribbons of composition [Sb4Mo2O12] are obtained. Neighbouring ribbons are only held together by weak Sb-O bonds in the directions of a and b (Adiwidjaja et al., 2009).


 
4.DH.010. Raspite group
 
Raspite PbWO4 mon., P21/a G
Murphyite PbTe6+O4 mon., P21/a IMA 2021-107

Raspite: zig-zag chains of corner-sharing W-centered octahedra, connected by Pb in seven-fold coordination.
Murphyite is isostructural and forms a solid solution with raspite.


 
4.DH.015. Brannerite group
 
Thorutite (Th,U,Ca)Ti2O6 mon., C2/m G
Brannerite (U,Ca,Y,Ce)(Ti,Fe)2O6 mon., C2/m FOTO A
Orthobrannerite U4+U6+Ti4O12(OH)2 metamict (orth.) A

Brannerite: chains of corner-sharing Ti-centered octahedra forming a layer-like structure, the layers are connected by U in six-fold coordination.


 
4.DH.020. Iwashiroite-(Y)
 
Iwashiroite-(Y) YTaO4 metamict; mon., P2/a IMA 2003-053

Iwashiroite-(Y): Zig-zag chains of edge-sharing, distorted TaO6 octahedra. The chains are connected by Y atoms in YO8 coordination (distorted cube) (Hori et al., 2006).



 
 
4.DJ. With layers of corner-sharing M[6] octahedra + cations in other coordination
 
4.DJ.005. Koechlinite group
 
Koechlinite Bi2MoO6 orth., Pna21 FOTO G
Russellite Bi2WO6 orth., Pna21 FOTO G
Tungstibite Sb2WO6 orth., P22121 FOTO IMA 1993-059


 
4.DJ.010. Stibiotantalite group
 
Stibiocolumbite SbNbO4 orth., Pna21 G
Stibiotantalite SbTaO4 orth., Pna21 FOTO G
Bismutotantalite BiTaO4 orth., Pna21 G
Bismutocolumbite BiNbO4 orth., Pnan FOTO IMA 1991-003
Cervantite Sb3+Sb5+O4 orth., Pna21 FOTO IMA 1991-003


 
4.DJ.015. Clinocervantite group
 
Clinocervantite Sb3+Sb5+O4 mon., A2/a FOTO IMA 1997-017
Kyawthuite Bi3+Sb5+O4 mon., I2/c IMA 2015-078


 
4.DJ.020. Billwiseite
 
Billwiseite Sb5Nb3WO18 mon., C2/m IMA 2010-053


 
4.DJ.025. Foordite group
 
Thoreaulite SnTa2O6 mon., C2/c FOTO G
Foordite SnNb2O6 mon., C2/c FOTO IMA 1984-070

Foordite: corner-sharing NbO6 octahedra forming a perforated, two octahedron thick sheet. The sheets are connected by Sn in 8-fold coordination (distorted square anti-prism) (Ercit & Cerny, 1988).



 
 
4.DK. With layers of edge-sharing M[6] octahedra or edge- and corner-sharing M[6] octahedra + cations in other coordination
 
4.DK.005. Rosiaite
 
Rosiaite PbSb2O6 trig., P31m FOTO IMA 1995-021

Rosiaite: layers of edge-sharing SbO6 octahedra, 2/3rd occupied, alternating with layers of isolated PbO6 octahedra.


 
4.DK.010. Lucasite group
 
Lucasite-(Ce) CeTi2O5(OH) mon., I2/a IMA 1986-020
Kassite CaTi2O4(OH)2 mon., P21/a A

Kassite and Lucasite-(Ce): layers of edge-sharing TiO6 octahedra, 2/3rd occupied.


 
4.DK.015. Changbaiite
 
Changbaiite PbNb2O6 trig., R3m FOTO A

Changbaiite: dimers of edge-sharing octahedra, connected via corners to other dimers, forming a layer with trigonal and hexagonal rings (Olsen et al., 2014).



 
 
4.DL. With tunnel structures of edge-sharing M[6] octahedra + other cations
 
4.DL.005. Coronadite group (2 x 2 tunnel structure) [Hollandite supergroup]
 
Cryptomelane K(Mn4+7Mn3+)O16 mon., I2/m FOTO A
Manjiroite Na(Mn4+7Mn3+)O16 tetr., I4/m FOTO IMA 1966-009
Thalliomelane Tl(Mn4+7.5Cu2+0.5)O16 tetr., I4/m IMA 2019-055
Strontiomelane Sr(Mn4+6Mn3+2)O16 mon., I2/m A
Hollandite Ba(Mn4+6Mn3+2)O16 mon., I2/m FOTO G
Ferrihollandite Ba(Mn4+6Fe3+2)O16 mon., I2/m A
Coronadite Pb(Mn4+6Mn3+2)O16 mon., I2/m FOTO G
Ferricoronadite Pb(Mn4+6Fe3+2)O16 tetr., I4/m IMA 2015-093


 
4.DL.010. Priderite group (2 x 2 tunnel structure) [Hollandite supergroup]
 
Priderite K(Ti4+7Fe3+)O16 tetr., I4/m G
Henrymeyrite Ba(Ti4+7Fe2+)O16 tetr., I4/m FOTO IMA 1999-016
Mannardite Ba(Ti4+6V3+2)O16 tetr., I41/a IMA 1983-013
Redledgeite Ba(Ti4+6Cr3+2)O16 tetr., I4/m FOTO A


 
9.DL.015. Lingunite group (2 x 2 tunnel structure) [Hollandite supergroup]
 
Lingunite Na2(Si6Al2)O16 tetr., I4/m IMA 2004-054
Liebermannite K2(Si6Al2)O16 tetr., I4/m IMA 2013-128
Stöfflerite Ca2(Si4Al4)O16 tetr., I4/m IMA 2017-062

Lingunite is a polymorph of albite, NaAlSi3O8, with hollandite structure with Al and Si in octahedral coordination.


 
4.DL.020. Akaganeite (2 x 2 tunnel structure)
 
Akaganeite Fe8(OH,O)16Cl1.25 · n H2O mon., I2/m FOTO IMA 1962-004


 
4.DL.025. Romanèchite (2 x 3 tunnel structure)
 
Romanèchite (Ba,H2O)2(Mn4+,Mn3+)5O10 mon., C2/m FOTO A


 
4.DL.030. Todorokite (3 x 3 tunnel structure)
 
Todorokite (Na,Ca,K)1-x(Mn,Mg,Al)6O12·3-4H2O mon., P2/m A



 
 
4.DM. Fluorite type and fluorite derivative structures
 
4.DM.005. Uraninite group
 
Zirkelite (Ti,Ca,Zr)O2-x cub., Fm3m Rd
Tazheranite (Zr,Ti,Ca)(O,□)2 cub., Fm3m FOTO IMA 1969-008
Cerianite-(Ce) CeO2 cub., Fm3m FOTO A
Thorianite ThO2 cub., Fm3m FOTO G
Uraninite UO2 cub., Fm3m FOTO G
Vorlanite CaUO4 cub., Fm3m IMA 2009-032


 
4.DM.010. Ziroite
 
Ziroite ZrO2 tetr., P42/nmc IMA 2022-013

Ziroite: tetragonal distorted fluorite derivative structure. Zr is in eight-fold coordination.


 
4.DM.015. Zirconolite group
 
Zirconolite (Ca,Y)Zr(Ti,Mg,Al)2O7 mon., C2/c FOTO Rd
Laachite (Ca,Mn)2Zr2Nb2TiFeO14 mon., C2/c IMA 2012-100
Stefanweissite (Ca,REE)2Zr2(Nb,Ti)(Ti,Nb)2FeO14 orth., Cmca IMA 2018-020
Nöggerathite-(Ce) (Ce,Ca)2Zr2(Nb,Ti)(Ti,Nb)2FeO14 orth., Cmca IMA 2017-107

Zirconolite polytypes: Zirconolite-2M (mon., C2/c), Zirconolite-3O (orth., Acam), Zirconolite-3T (trig., P3121).


 
4.DM.020. Calzirtite group
 
Calzirtite Ca2Zr5Ti2O16 tetr., I41/acd A
Hiärneite Ca2Zr4Mn3+SbTiO16 tetr., I41/acd IMA 1996-040

Calzirtite polytypes: Calzirtite-1Q (tetr., I41/acd), Calzirtite-1O (orth., Pbca).


 
4.DM.025. Pyrochlore group [Pyrochlore supergroup]
 
Hydrokenopyrochlore (□,...)2Nb2O6(H2O) cub. IMA 2017-005
Hydroxykenopyrochlore (□,Ce,Ba)2(Nb,Ti)2O6(OH,F) cub. IMA 2017-030a
Hydropyrochlore (H2O,□)2Nb2(O,OH)6(H2O) cub., Fd3m Rd
Hydroxynatropyrochlore (Na,Ca,Ce)2Nb2O6(OH) cub. IMA 2017-074
Fluornatropyrochlore (Na,Pb,Ca,REE)2Nb2O6F cub. IMA 2013-056
Fluorcalciopyrochlore (Ca,Na)2(Nb,Ti)2O6F cub. IMA 2013-055
Hydroxycalciopyrochlore (Ca,Na,U,□)2(Nb,Ti)2O6(OH) cub., Fd3m IMA 2011-026
Oxycalciopyrochlore Ca2Nb2O6O cub., Fd3m Rd
Hydroxymanganopyrochlore (Mn,Th,Na,Ca,REE)2(Nb,Ti)2O6(OH) cub., Fd3m IMA 2012-005
Hydroxyplumbopyrochlore (Pb1.5□0.5)Nb2O6(OH) cub., Fd3m IMA 2018-145
Cesiokenopyrochlore □2Nb2(O,OH)6Cs1-X cub. IMA 2016-104

Hydropyrochlore, redefined, originally described as Kalipyrochlore.


 
4.DM.030. Microlite group [Pyrochlore supergroup]
 
Hydrokenomicrolite (□,H2O)2Ta2(O,OH)6(H2O) cub., Fd3m IMA 2011-103
Hydroxykenomicrolite (□,Na,Sb3+)2Ta2O6(OH) cub. Rd
Fluornatromicrolite (Na1.5Bi0.5)Ta2O6F cub., Fd3m FOTO IMA 1998-018
Oxynatromicrolite (Na,Ca,U)2(Ta,Nb)2O6(O,F) cub., Fd3m IMA 2013-063
Fluorcalciomicrolite (Ca,Na)2Ta2O6F cub., Fd3m IMA 2012-036
Hydroxycalciomicrolite (Ca1.5□0.5)Ta2O6(OH) cub., Fd3m IMA 2013-073
Oxycalciomicrolite Ca2Ta2O6O cub., Fd3m IMA 2019-110
Oxystannomicrolite Sn2Ta2O6O cub., Fd3m Rd
Kenoplumbomicrolite (Pb,□)2Ta2O6(□,(OH),O) cub., Fd3m FOTO IMA 2015-007a
Oxystibiomicrolite (Sb3+,Ca)2Ta2O6O cub., Fd3m Rd
Oxybismutomicrolite (Bi3+1.33□0.67)Ta2O6O cub., Fd3m FOTO IMA 2019-047

Hydroxykenomicrolite, redefined, originally described as 'Cesstibtantite'.


 
4.DM.035. Betafite group [Pyrochlore supergroup]
 
Oxyyttrobetafite-(Y) Y2Ti2O6O cub., Fd3m IMA 2022-002


 
4.DM.040. Roméite group [Pyrochlore supergroup]
 
Fluorcalcioroméite (Ca,Na)2Sb5+2O6(F,OH) cub., Fd3m IMA 2012-093
Hydroxycalcioroméite (Ca,Sb3+)2(Sb5+,Ti)2O6(OH) cub., Fd3m Rd
Oxycalcioroméite Ca2Sb5+2O6O cub., Fd3m IMA 2012-022
Hydroxyferroroméite (Fe2+1.5□0.5)Sb5+2O6(OH) cub., Fd3m IMA 2016-006
Stibiconite (Sb3+□)Sb5+2O6(OH) cub. Q
Oxyplumboroméite Pb2Sb5+2O6O cub., Fd3m IMA 2013-042
Bindheimite Pb2Sb5+2O7 cub. FOTO Q
Monimolite Pb2Sb5+2O7 cub. Q
Stetefeldtite Ag2Sb5+2(O,OH)7 cub. Q
Bismutostibiconite (Bi,Fe,□)2Sb5+2O7 cub. Q

Hydroxycalcioroméite, redefined, originally described as Lewisite.


 
4.DM.045. Elsmoreite group [Pyrochlore supergroup]
 
Hydrokenoelsmoreite □2W2O6(H2O) cub., Fd3m FOTO A
Hydroxykenoelsmoreite (□,Pb)2(W,Fe,Al)2(O,OH)6(OH) cub., Fd3m IMA 2016-056
Hydroplumboelsmoreite (Pb□)(W1.33Fe0.67O6(H2O) cub., Fd3m Rd

Hydrokenoelsmoreite, redefined, originally described as Elsmoreite, and includes also the material originally described as Ferritungstite and Alumotungstite.
Hydroplumboelsmoreite, redefined, originally described as Jixianite.


 
4.DM.050. Pittongite
 
Pittongite (Na,H2O)0.7(W,Fe)(O,OH)3 hex., P6ms IMA 2005-034

Pittongite: related to the pyrochlore structure.


 
4.DM.055. Ingersonite
 
Ingersonite Ca3MnSb4O14 trig. IMA 1986-021

Ingersonite: related to the pyrochlore structure.


 
4.DM.060. Pengite
 
Pengite (Pb8Sb3+3)Sb5+9O35 trig., R3m IMA 2022-068

Pengite: related to the pyrochlore structure.


 
4.DM.065. Murataite
 
Murataite-(Y) (Y,Na)6(Zn,Fe)4[(Ti,Nb)4ZnO29(O,F,OH)14] cub., F43m IMA 1972-007



 
 
4.DN. With other types of arrangements of M[6] octahedra + cations in other coordination
 
4.DN.005. Natrotantite group
 
Natrotantite Na2Ta4O11 trig., R3c IMA 1980-026
Calciotantite CaTa4O11 hex., P6322 IMA 1981-039
Irtyshite Na2(Ta,Nb)4O11 hex., P63/m or P63 IMA 1984-025

Natrotantite: alternating layers of (1) edge-sharing NaO7 polyhedra and TaO6 octahedra, and (2) edge-sharing pentagonal TaO7 bipyramides (Ercit et al, 1985).


 
4.DN.010. Anzaite-(Ce)
 
Anzaite-(Ce) Ce4FeTi6O18(OH)2 mon., C2/m IMA 2013-004

Anzaite-(Ce): alternating layers of (1) REE in square antiprismatic coordination and Fe in octahedral coordination and (2) fivefold- and octahedrally coordinated Ti (Chakhmouradian et al., 2015).



 
 
4.DO. With various other polyhedra, without M[6] octahedra
 
4.DO.005. Downeyite
 
Downeyite SeO2 tetr., P42/mbc IMA 1974-063

Structure: chains of trigonal corner-sharing SeO3 pyramides, with Se forming the top of the pyramide.


 
4.DO.010. Tellurite
 
Tellurite TeO2 orth., Pbca FOTO G

Structure: edge-sharing TeO4 groups forming Te2O6 units, arranged in sheets perpendicular to the a direction.


 
4.DO.015. Paratellurite
 
Paratellurite TeO2 tetr., P43212 FOTO A


 
4.DO.020. Akhtenskite
 
Akhtenskite MnO2 hex., P63/mmc IMA 1982-072

Akhtenskite: correspond to ε-MnO2. It has a partially ordered defect NiAs structure containing 50% cation vacancies (Kim et al., 2006). Mn is situated in the center of trigonal prisms in sixfold coordination.


 
4.DO.025. Baddeleyite group
 
Akaogiite TiO2 mon., P21/c IMA 2007-058
Baddeleyite ZrO2 mon., P21/c FOTO G

With MeO7 polyhedra.


 
4.DO.030. Petscheckite group
 
Petscheckite U4+Fe2+(Nb,Ta)2O8 metamict, trig., P31m IMA 1975-038
Liandratit U6+(Nb,Ta)2O8 metamict, trig., P31m IMA 1975-039

Liandratite and Petscheckite: U is coordinated to 6 oxygen in a distorted hexagonal planar way, Ta is in eight-fold, distorted cubic body-centered coordination.


 
4.DO.035. Koragoite
 
Koragoite Mn2MnNb2(Nb,Ta)3W2O20 mon., P21 IMA 1994-049



 
 
4.DP. Unclassified oxides
 
4.DP.005. Rankamaite group
 
Rankamaite (Na,K,Pb)(Ta,Nb,Al)4(O,OH)10 orth. FOTO IMA 1968-002
Sosedkoite K5Al2Ta22O60 orth. IMA 1981-014


 
4.DN.010. Cesplumtantite
 
Cesplumtantite (Cs,Na)2(Pb,Sb)3Ta8O24 tetr. IMA 1985-040


 
4.DN.015. Eyselite
 
Eyselite Fe3+Ge4+3O7(OH) orth., P... IMA 2003-052


 
4.DN.020. Y-Ti/Nb oxides with unknown structure
 
Yttrotantalite-(Y) YTaO4 metamict; orth. FOTO Rn
Kobeite-(Y) (Y,U)(Ti,Nb)2(O,OH)6 (?) metamict A
Yttrocrasite-(Y) (Y,Th,Ca,U)(Ti,Fe)2(O,OH)6 metamict Q
Loranskite-(Y) (Y,Ce,Ca)(Zr,Ta)2(O,OH)6 (?) metamict A
Yttrocolumbite-(Y) (Y,U,Fe)(Nb,Ta)O4 orth. Q
Pisekite-(Y) (Y,As,Ca)(Nb,Ti,Ta)O4 (?) mon. (?) Q


 
 

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

To distinguish from classical Strunz numbering, on hierarchical "group" level, a numbering with 3 digits is used, like "4.DA.005. Quartz group", instead of 2 digits (like "4.DA.05.") in the Strunz system.


© Thomas Witzke (2024)


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