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Pyrochlore Group

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Formula:
A2Nb2(O,OH)6Z
A is Na, Ca, Sn2+, Sr, Pb2+, Sb3+, Y, U4+, H2O or ◻.

Z is OH, F, O, H2O or ◻
Lustre:
Vitreous, Resinous
Name:
The pyrochlore group has its name after the generic name pyrochlore which was first introduced by J. J. Berzelius for a cubic mineral found by N.O.Tank in the 1820s in a syenite pegmatite at Stavern (formerly Fredriksvärn), Norway (Wöhler 1826). It is dervied from the Greek πΰρ, fire, and χλωρός, green in allusion to the fact that the mineral usually turns green on ignition.
Nb-dominant members of the Pyrochlore Supergroup.

The nomenclature was recently revised by Atencio et al. (2010) and Christy and Atencio (2013).
A correct identification of the individual members of the pyrochlore group is only possible using a combination of several analytical methods.


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Classification of Pyrochlore GroupHide

Approved
Notes:
Group Name
Approval History:
Renamed by IMA: 2010
4.00.

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
0 :
0 :
8.2.1.1

8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
2 : A2B2O6(O,OH,F)
18.2.8

18 : Niobates and Tantalates
2 : Niobates and tantalates containing rare earths but not U

Physical Properties of Pyrochlore GroupHide

Vitreous, Resinous
Transparency:
Transparent
Fracture:
Irregular/Uneven, Splintery, Sub-Conchoidal

Chemical Properties of Pyrochlore GroupHide

Formula:
A2Nb2(O,OH)6Z

A is Na, Ca, Sn2+, Sr, Pb2+, Sb3+, Y, U4+, H2O or ◻.

Z is OH, F, O, H2O or ◻

Crystallography of Pyrochlore GroupHide

Morphology:
Crystals octahedral, often with subordinate {011}, {113} or {001}. Irregular masses and embedded grains.

X-Ray Powder DiffractionHide

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Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Type Occurrence of Pyrochlore GroupHide

Synonyms of Pyrochlore GroupHide

Other Language Names for Pyrochlore GroupHide

Varieties of Pyrochlore GroupHide

Aluminobetafite (of Kawai)
Bariopyrochlore (of Hogarth 1977)A zero-valent dominant pyrochlore.
Ceriopyrochlore (of Hogarth 1977)
Plumbopyrochlore (of Skorobogatova et al.)
Stibiopyrochlore (of Pezzotta et al.)
Yttropyrochlore (of Hogarth 1977)
Zero valent dominant member of Pyrochlore GroupA pyrochlore group member where there is a cation deficit comprised mainly of H2O or site vacancies. This name is used to describe any pyrochlore where it is not possible to specify more accurately than this.

Relationship of Pyrochlore Group to other SpeciesHide

Other Members of this group:
Betafite GroupA2(Ti,Nb)2O6Z
Coulsellite GroupGroup, where M2+ cations are dominant at the B site, and Mg is dominant among them, and F1– is ...
Elsmoreite GroupW-dominant members of the Pyrochlore Supergroup.
Microlite GroupTa-dominant members of the Pyrochlore Supergroup.Iso. m3m (4/m 3 2/m) : Fd3m
Ralstonite GroupGroup, where M3+ cations are dominant at the B site, and Al is dominant among them, and F1– is ...
Roméite GroupSb-dominant members of the Pyrochlore Supergroup.
Group Members:
Cesiokenopyrochlore □Nb2(O,OH)6Cs1−x (x ∼ 0.20)Iso. m3m (4/m 3 2/m) : Fd3m
Fluorcalciopyrochlore (Ca,Na)2(Nb, Ti)2O6FIso.
Fluorhydropyrochlore 
Fluorkenopyrochlore (□,Sr,Ce,Ca,Na)2(Nb,Ti)2O6F
Fluornatropyrochlore (Na,Pb,Ca,REE,U)2Nb2O6FIso. m3m (4/m 3 2/m)
Fluorplumbopyrochlore (Pb,Y,Th,U,Na,Ca)2-x(Nb,Ti)2O6FIso.
Fluorstrontiopyrochlore (Sr,□)2Nb2(O,OH)6F
Hydrokenopyrochlore 2Nb2O4(OH)2(H2O)Iso. m3m (4/m 3 2/m) : Fd3m
Hydropyrochlore (H2O,□)2Nb2(O,OH)6(H2O)Iso. m3m (4/m 3 2/m) : Fd3m
Hydroxycalciopyrochlore (Ca,Na,U,□)2(Nb,Ti)2O6(OH)Iso. m3m (4/m 3 2/m) : Fd3m
Hydroxymanganopyrochlore (Mn2+,Th,Na,Ca,REE)2(Nb,Ti)2O6(OH) Iso. m3 (2/m 3)
Hydroxyplumbopyrochlore (Pb,Ca)2-x(Nb,Ti,Ta)2O6(OH)
Kenoplumbopyrochlore (Pb,□)Nb2O6(□,O)
Oxycalciopyrochlore Ca2Nb2O6OIso. m3m (4/m 3 2/m) : Fd3m
Oxynatropyrochlore (Na,Ca,U)2Nb2O6(O,OH)
Oxyplumbopyrochlore Pb2Nb2O6O
Oxyyttropyrochlore-(Y) (Y,◻)2Nb2O6O

Related Minerals - Nickel-Strunz GroupingHide

4.00.Goethiteα-Fe3+O(OH)Orth. mmm (2/m 2/m 2/m)
4.00.Microlite GroupIso. m3m (4/m 3 2/m) : Fd3m
4.00.Ferrotaaffeite-6N'3S(Be,Zn,Mg)FeAl4O8Trig.
4.00.Roméite Group
4.00.Ferrohögbomite-2N2S[(Fe2+,Mg,Zn,Al)3(Al,Ti,Fe3+)8O15(OH)]2Hex. 6mm : P63mc
4.00.Písekite-(Y)(Y,As,Ca,Fe,U)(Nb,Ti,Ta)O4
4.00.UM2004-19-O:AlCeGdZr(Gd,Ce)4Al2Zr4O17
4.00.UM2004-21-O:CaFeGdZrCa2Gd4Fe5ZrO15
4.00.UM2004-27-O:GdTiGd2Ti4O11
4.00.Mapiquiroite(Sr,Pb)(U,Y)Fe2(Ti,Fe3+,Cr3+)18O38Trig. 3 : R3
4.00.AlmeidaitePbZn2(Mn,Y)(Ti,Fe3+)18O37(OH,O)Trig. 3 : R3
4.00.VapnikiteCa2CaUO6Mon. 2/m

Related Minerals - Dana Grouping (8th Ed.)Hide

8.2.1.2Hydropyrochlore(H2O,□)2Nb2(O,OH)6(H2O)Iso. m3m (4/m 3 2/m) : Fd3m
8.2.1.3Bariopyrochlore (of Hogarth 1977)A2Nb2(O,OH)6ZIso. m3m (4/m 3 2/m) : Fd3m
8.2.1.4Yttropyrochlore (of Hogarth 1977)A2Nb2(O,OH)6Z
8.2.1.5Ceriopyrochlore (of Hogarth 1977)A2Nb2(O,OH)6Z
8.2.1.6Plumbopyrochlore (of Skorobogatova et al.)A2Nb2(O,OH)6Z
8.2.1.7Uranpyrochlore (of Hogarth 1977)(U,Ca,Ce)2(Nb,Ta)2O6(OH,F)Iso.
8.2.1.8Strontiopyrochlore (of Hogarth 1977)A2Nb2(O,OH)6Z

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

18.2.1Fergusonite-(Y)YNbO4Tet. 4/m : I41/a
18.2.2Fergusonite-(Y)-βYNbO4Mon. 2/m
18.2.3Fergusonite-(Ce)(Ce,La,Nd)NbO4
18.2.4Fergusonite-(Ce)-β(Ce,La,Nd)NbO4
18.2.5Fergusonite-(Nd)(Nd,Ce)(Nb,Ti)O4
18.2.6Fergusonite-(Nd)-β(Nd,Ce)NbO4
18.2.7Formanite-(Y)YTaO4Tet. 4/m : I41/a
18.2.9Ceriopyrochlore (of Hogarth 1977)A2Nb2(O,OH)6Z
18.2.10Strontiopyrochlore (of Hogarth 1977)A2Nb2(O,OH)6Z
18.2.11Loparite-(Ce)(Na,REE)Ti2O6
18.2.12Fersmite(Ca,Ce,Na)(Nb,Ta,Ti)2(O,OH,F)6Orth. mmm (2/m 2/m 2/m) : Pbcn
18.2.13Aeschynite-(Ce)(Ce,Ca,Fe,Th)(Ti,Nb)2(O,OH)6Orth. mmm (2/m 2/m 2/m) : Pmna
18.2.14Aeschynite-(Nd)(Nd,Ln,Ca)(Ti,Nb)2(O,OH)6Orth. mmm (2/m 2/m 2/m)
18.2.15Aeschynite-(Y)(Y,Ln,Ca,Th)(Ti,Nb)2(O,OH)6Orth. mmm (2/m 2/m 2/m) : Pmna
18.2.16Nioboaeschynite-(Ce)(Ce,Ca)(Nb,Ti)2(O,OH)6Orth.
18.2.17Nioboaeschynite-(Nd)(Nd,Ce,Ca,Th)(Nb,Ti,Fe,Ta)2(O,OH)6Orth.
18.2.18Tantalaeschynite-(Y)Y(Ta,Ti,Nb)2O6Orth. mmm (2/m 2/m 2/m)
18.2.19Vigezzite(Ca,Ce)(Nb,Ta,Ti)2O6Orth.
18.2.20Murataite-(Y)(Y,Na)6Zn(Zn,Fe3+)4(Ti,Nb,Na)12O29(O,F,OH)10F4 Iso. m3m (4/m 3 2/m) : Fm3m

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Pyrochlore GroupHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Wöhler, F. (1826): Ueber den Pyrochlor, eine neue Mineralspecies. Annalen der Physik und Chemie. 7, 417-428
Rose (1840), Ann. Phys.: 48: 562 (as Pyrrhit).
Knop (1875), Jb. Min.: 67.
Allen (1877), American Journal of Science: 14: 128 (as Hatchettolite).
Smith (1877), American Journal of Science: 13: 365 (as Hatchettolite).
Hubbard (1886), Verh. natur-hist. Ver. preuss. Rheinland, Sitzber.: 43: 217 (as Azor-pyrrhit).
Holmqist (1896), Geological Institute Upsala, Bulletin: 3: 181 (as uranpyrochlore).
Flink (1898), Meddelelser om Grønland: 14: 234 (as chalcolamprite).
Flink (1901), Meddelelser om Grønland: 24: 166 (as Endeiolite).
Gaertner (1930), Jb. Min., Beil.-Bd.: 61: 1.
Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 748-756.
Hogarth, D.D. (1961) A study of pyrochlore and betafite. Canadian Mineralogist: 6: 610-633.
American Mineralogist (1977): 62: 403-410.
Hogarth, D.D. (1989) Pyrochlore, apatite and amphibole: distinctive minerals in carbonatite. In K. Bell, Ed., Carbonatites: Genesis and Evolution: 105-148. Unwin Hyman Ltd., London.
Anthony, J.W., Bideaux, R.A., Bladh, K.W., and Nichols, M.C. (1997) Handbook of Mineralogy, Volume III. Halides, Hydroxides, Oxides. Mineral Data Publishing, Tucson, AZ, 628pp.: 457.
Bonazzi, P., Bindi, L., Zoppi, M., Capitani, G.C., and Olmi, F. (2006) Single-crystal diffraction and transmission electron microscopy studies of "silicified" pyrochlore from Narssârssuk, Julianehaab district, Greenland. American Mineralogist: 91: 794-801.
Birch, W.D., Grey, I.E., Mills, S.J., Bougerol, C., Pring, A., Ansermet, S. (2007): Pittongite, a new secondary tungstate from Pittong, Victoria, Australia. Canadian Mineralogist, 45, 857-864.
Atencio D., Andrade M.B., Christy A.G., Giere R., Kartashov P.M. (2010): The pyrochlore supergroup of minerals: nomenclature. Canadian Mineralogist, 48, 569-594.
Christy, A. G. and Atencio, D. (2013): Clarification of status of species in the pyrochlore supergroup. Mineralogical Magazine, 77, 13-20.

Internet Links for Pyrochlore GroupHide

Localities for Pyrochlore GroupHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListShow

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