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Bariopyrochlore

Big Photo

Kukisvumchorr Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
© Pavel M. Kartashov

Show Bariopyrochlore Photos (2)
Formula:
(Ba,Sr)
 
2
(Nb,Ti)
 
2
(O,OH)
 
7
System:IsometricColour:Yellowish grey, light ...
Hardness:4½ - 5
Name:Assigned by the IMA Committee on pyrochlore nomenclature for the predominant barium content and membership in the pyrochlore group.


Pyrochlore Group. Pyrochlore Subgroup.

Classification of Bariopyrochlore

IMA status:Approved
Strunz 8th edition ID:4/C.17-50
Nickel-Strunz 10th (pending) edition ID:4.DH.15

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
H : With large (+- medium-sized) cations; sheets of edge-sharing octahedra
Dana 8th edition ID:8.2.1.3

8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
2 : A2B2O6(O,OH,F)
Hey's CIM Ref.:18.1.17

18 : Niobates and Tantalates
1 : Niobates and tantalates containing neither rare earths nor U
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Type Occurrence of Bariopyrochlore

Type Locality:Panda Hill, Mbeya, Amboseli, Mbeya Region, Tanzania
General Appearance of Type Material:Crude to anhedral crystals to 1 mm, granular, porous due to alteration or recrystallization
Geological Setting of type material:Contact zone of a highly weathered biotite-rich rock in a roof pendant in a carbonatite
Associated Minerals at type locality:
ZirconRutileQuartzLimoniteKaolinite
HematiteFluoriteChlorite GroupBiotiteApatite
Albite-Anorthite Series

Occurrences of Bariopyrochlore

Geological Setting:In weathered carbonatites; in an alkalic aegirine-albite-microcline metasomatite in nepheline syenite

Physical Properties of Bariopyrochlore

Lustre:Vitreous, Resinous
Diaphaneity (Transparency):Translucent, Opaque
Colour:Yellowish grey, light olive grey to very pale orange; white with many fine, colourless inclusions
Streak:White
Hardness (Mohs):4½ - 5
Hardness (Vickers):VHN100=550 kg/mm2
Tenacity:Brittle
Cleavage:Poor/Indistinct
very poor on {111}
Fracture:Conchoidal
Density (measured):3.85 - 4.15 g/cm3
Density (calculated):4.01 g/cm3

Crystallography of Bariopyrochlore

Crystal System:Isometric
Class (H-M):m3m (4/m 3 2/m) - Hexoctahedral
Space Group:Fd3m (F41/d 3 2/m)
Cell Parameters:a = 10.562Å
Unit Cell Volume:V 1,178.25 ų (Calculated from Unit Cell)
Z:8
Morphology:Crystals show cube and octahedron faces
X-Ray Powder Diffraction:
d-spacingIntensity
3.044 (100)
6.09 (80)
1.864 (70)
1.590 (70)
1.0164 (60)
3.18 (50)
Comments:Recorded on type material

Optical Data of Bariopyrochlore

Type:Isotropic
RI values: n = 2.07 - 2.11
Maximum Birefringence:δ = 0.000 - Isotropic minerals have no birefringence
Surface Relief:Very High
Internal Reflections:Colourless to white, occasionally brownish to reddish

Chemical Properties of Bariopyrochlore

Formula:
(Ba,Sr)
 
2
(Nb,Ti)
 
2
(O,OH)
 
7
Essential elements:Ba, Nb, O
All elements listed in formula:Ba, H, Nb, O, Sr, Ti
Analyical Data:Analysis of type material by spectrographic methods, water by Penfield's method. The data are corrected for zircon (0.42 wt.-%), phlogopite (0.27 wt.-%), orthoclase (0.42 wt.-%), apatite (0.92 wt.-%), cassiterite (0.32 wt.-%), quartz (0.33 wt.-%), rutile (0.15 wt.-%), CuO (0.01 wt.-%), PbO (0.01 wt.-%) and CO2 (0.01 wt.-%).
Nb2O3 (69.06)
Ta2O5 (0.23)
TiO2 (3.87)
ThO2 (0.62)
Ce2O3 (0.06)
FeO (0.44)
CaO (0.86)
BaO (12.88)
SrO (6.60)
Na2O (0.28)
K2O (0.15)
H2O (4.11)

sum 101.16 wt.-%
Empirical Formula:
(Ba
 
0.30
Sr
 
0.22
Ca
 
0.05
Ce
 
0.04
Na
 
0.03
Fe
 
0.02
K
 
0.01
Th
 
0.01
)
 
=0.68
(Nb
 
1.83
Ti
 
0.17
)
 
=2.00
O
 
5.61
(H
 
2
O)
 
0.80

Relationship of Bariopyrochlore to other Species

Related Minerals - Nickel-Strunz Grouping):
4.DH.05Brannerite
(U
4+
 
,Ca)(Ti,Fe
3+
 
)
 
2
O
 
6
4.DH.05Orthobrannerite
UTi
 
4
O
 
12
(OH)
 
2
4.DH.05Thorutite
(Th,U,Ca)Ti
 
2
(O,OH)
 
6
4.DH.10Kassite
CaTi
 
2
O
 
4
(OH)
 
2
4.DH.10Lucasite-(Ce)
CeTi
 
2
(O,OH)
 
6
4.DH.15Alumotungstite
(W,Al)(O,OH)
 
3
4.DH.15Bariomicrolite
Ba(Ta,Nb)
 
2
(O,OH)
 
7
4.DH.15Betafite
(Ca,U)
 
2
(Ti,Nb)
 
2
O
 
6
(OH)
4.DH.15Bismutomicrolite
(Bi,Ca)(Ta,Nb)
 
2
O
 
6
(OH)
4.DH.15Calciobetafite
(Ca,RE,Th,U)
 
2
(Nb,Ta,Ti)
 
2
O
 
7
4.DH.15Ceriopyrochlore-(Ce)
(Ce,Ca,Y)
 
2
(Nb,Ta)
 
2
O
 
6
(OH,F)
4.DH.15Cesstibtantite
(Cs,Na)SbTa
 
4
O
 
12
4.DH.15Ferritungstite
(W,Fe
3+
 
)(O,OH)
 
3
4.DH.15Jixianite
Pb(W,Fe
3+
 
)
 
2
(O,OH)
 
7
4.DH.15Kalipyrochlore
(K,Sr)
 
2-x
Nb
 
2
O
 
6
(O,OH)·nH
 
2
O
4.DH.15Microlite
(Ca,Na)
 
2
Ta
 
2
O
 
6
(O,OH,F)
4.DH.15Natrobistantite
(Na,Cs)Bi(Ta,Nb,Sb)
 
4
O
 
12
4.DH.15Plumbopyrochlore
(Pb,Y,U,Ca)
 
2-x
Nb
 
2
O
 
6
(OH)
4.DH.15Plumbomicrolite
(Pb,Ca,U)
 
2
Ta
 
2
O
 
6
(OH)
4.DH.15Plumbobetafite
(Pb,U,Ca)(Ti,Nb)
 
2
O
 
6
(OH,F)
4.DH.15Pyrochlore
(Ca,Na)
 
2
Nb
 
2
O
 
6
(OH,F)
4.DH.15Stibiomicrolite
(Sb,Ca,Na)
 
2
(Ta,Nb)
 
2
O
 
7
4.DH.15Strontiopyrochlore
(Sr,Ce,Ca)
 
0.66
(Nb,Fe)
 
2
(O,OH)
 
7
4.DH.15Stannomicrolite
(Sn,Fe,Mn)
 
2
(Ta,Nb,Sn)
 
2
(O,OH)
 
7
4.DH.15Stibiobetafite
(Sb,Ca)
 
2
(Ti,Nb,Ta)
 
2
(O,OH)
 
7
4.DH.15Uranmicrolite
(U,Ca,Ce)
 
2
(Ta,Nb)
 
2
O
 
6
(OH,F)
4.DH.15Uranpyrochlore
(U,Ca,Ce)
 
2
(Nb,Ta)
 
2
O
 
6
(OH,F)
4.DH.15Yttrobetafite-(Y)
(Y,U,Ce)
 
2
(Ti,Nb,Ta)
 
2
O
 
6
OH
4.DH.15Yttropyrochlore-(Y)
(Y,Na,Ca,U)
 
1-2
(Nb,Ta,Ti)
 
2
(O,OH)
 
7
4.DH.15Fluornatromicrolite
(Na,Ca,Bi)
 
2
Ta
 
2
O
 
6
F
4.DH.15Bismutopyrochlore
(Bi,U,Ca,Pb)
 
1+x
(Nb,Ta)
 
2
O
 
6
(OH)·nH
 
2
O
4.DH.15Thorian Pyrochlore
4.DH.15Elsmoreite
WO
 
3
·0.5H
 
2
O
4.DH.20Bismutostibiconite
Bi(Sb
5+
 
,Fe
3+
 
)
 
2
O
 
7
4.DH.20Bindheimite
Pb
 
2
Sb
 
2
O
 
6
(O,OH)
4.DH.20Monimolite
(Pb,Ca,Fe)
 
3
Sb
 
2
O
 
7
4.DH.20Partzite
Cu
 
2
Sb
 
2
(O,OH)
 
7
4.DH.20Roméite
(Ca,Fe,Mn,Na)
 
2
(Sb,Ti)
 
2
O
 
6
(O,OH,F)
4.DH.20Stetefeldtite
Ag
 
2
Sb
 
2
(O,OH)
 
7
4.DH.20Stibiconite
SbSb
 
2
O
 
6
(OH)
4.DH.25Rosiaite
PbSb
5+
2
O
 
6
4.DH.30Zirconolite
CaZrTi
 
2
O
 
7
4.DH.35Liandratite
U(Nb,Ta)
 
2
O
 
8
4.DH.35Petscheckite
UFe(Nb,Ta)
 
2
O
 
8
4.DH.40Ingersonite
Ca
 
3
MnSb
 
4
O
 
14
4.DH.45Pittongite
Na
 
0.22
(W,Fe
3+
 
)(O,OH)
 
3
 · 0.44H
 
2
O
Related Minerals - Hey's Index Grouping:
18.1.1Lithiotantite
Li(Ta,Nb)
 
3
O
 
8
18.1.2Lueshite
NaNbO
 
3
18.1.3Natroniobite
NaNbO
 
3
18.1.4Franconite
Na
 
2
Nb
 
4
O
 
11
·9H
 
2
O
18.1.5Natrotantite
Na
 
2
Ta
 
4
O
 
11
18.1.6Irtyshite
Na
 
2
(Ta,Nb)
 
4
O
 
11
18.1.7Rankamaite
(Na,K,Pb,Li)
 
3
(Ta,Nb,Al)
 
11
(O,OH)
 
30
18.1.8Kalipyrochlore
(K,Sr)
 
2-x
Nb
 
2
O
 
6
(O,OH)·nH
 
2
O
18.1.9Calciotantite
CaTa
 
4
O
 
11
18.1.10Rynersonite
Ca(Ta,Nb)
 
2
O
 
6
18.1.11Microlite
(Ca,Na)
 
2
Ta
 
2
O
 
6
(O,OH,F)
18.1.12Belyankinite
Ca
 
1-2
(Ti,Zr,Nb)
 
5
O
 
12
 · 9H
 
2
O (?)
18.1.13Latrappite
(Ca,Na)(Nb,Ti,Fe)O
 
3
18.1.14Hochelagaite
(Ca,Na,Sr)(Nb,Ti,Si,Al)
 
4
O
 
11
·8H
 
2
O
18.1.15Bariomicrolite
Ba(Ta,Nb)
 
2
(O,OH)
 
7
18.1.16Parabariomicrolite
BaTa
 
4
O
 
10
(OH)
 
2
·2H
 
2
O
18.1.18Alumotantite
AlTaO
 
4
18.1.19Simpsonite
Al
 
4
(Ta,Nb)
 
3
O
 
13
(OH,F)
18.1.20Sosedkoite
(K,Na)
 
5
Al
 
2
(Ta,Nb)
 
22
O
 
60
18.1.21Thoreaulite
SnTa
 
2
O
 
6
18.1.22Stannomicrolite
(Sn,Fe,Mn)
 
2
(Ta,Nb,Sn)
 
2
(O,OH)
 
7
18.1.23Foordite
(Sn,Pb)(Nb,Ta)
 
2
O
 
6
18.1.24Changbaiite
PbNb
 
2
O
 
6
18.1.25Plumbopyrochlore
(Pb,Y,U,Ca)
 
2-x
Nb
 
2
O
 
6
(OH)
18.1.26Plumbomicrolite
(Pb,Ca,U)
 
2
Ta
 
2
O
 
6
(OH)
18.1.27Stibiocolumbite
Sb(Nb,Ta)O
 
4
18.1.28Stibiotantalite
Sb(Ta,Nb)O
 
4
18.1.29Natrobistantite
(Na,Cs)Bi(Ta,Nb,Sb)
 
4
O
 
12
18.1.30Cesplumtantite
(Cs,Na)
 
2
(Pb,Sb
3+
 
)
 
3
Ta
 
8
O
 
24
18.1.31Stibiomicrolite
(Sb,Ca,Na)
 
2
(Ta,Nb)
 
2
O
 
7
18.1.32Cesstibtantite
(Cs,Na)SbTa
 
4
O
 
12
18.1.33 Stibobetafite
(Ca,Sb)
 
2
(Ti,Nb,Ta)
 
2
(O,OH)
 
7
18.1.34Bismutotantalite
Bi(Ta,Nb)O
 
4
18.1.35Bismutomicrolite
(Bi,Ca)(Ta,Nb)
 
2
O
 
6
(OH)
18.1.36Tantalite-(Mn)
MnTa
 
2
O
 
6
18.1.37Gerasimovskite
(Mn,Ca)(Nb,Ti)
 
5
O
 
12
·9H
 
2
O
18.1.38Tapiolite-(Mn)
(Mn,Fe)(Ta,Nb)
 
2
O
 
6
18.1.39Columbite-(Mn)
(Mn,Fe)(Nb,Ta)
 
2
O
 
6
18.1.40Wodginite
Mn(Sn,Ta)Ta
 
2
O
 
8
18.1.41Ixiolite
(Ta,Nb,Sn,Fe,Mn)
 
4
O
 
8
18.1.42Columbite-(Fe)
FeNb
 
2
O
 
6
18.1.43Tantalite-(Fe)
FeTa
 
2
O
 
6
18.1.44Columbite
(Fe,Mn)(Nb,Ta)
 
2
O
 
6
18.1.45Tantalite
(Fe,Mn)(Ta,Nb)
 
2
O
 
6
18.1.46Tapiolite
(Fe,Mn)(Ta,Nb)
 
2
O
 
6
18.1.47Tapiolite-(Fe)
(Fe,Mn)(Ta,Nb)
 
2
O
 
6
18.1.48Columbite-(Mg)
(Mg,Fe,Mn)(Nb,Ta)
 
2
O
 
6
18.1.50Strüverite
(Ti,Ta,Fe)O
 
2
18.1.51 Staringite
(Fe,Mn)
 
x
(Ta,Nb)
 
2x
Sn
 
6-3x
O
 
12

Other Names for Bariopyrochlore

Synonyms:
Pandaite
German names:
BariopyrochlorPandait
Russian names:
Бариопирохлор
Spanish names:
Pandaita

Other Information

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

References for Bariopyrochlore

Reference List:Jäger, E., Niggli, E. and van der Veen, A. H. (1959): A hydrated barium-strontium pyrochlore in a biotite rock from Panda Hill, Tanganyika. Mineralogical Magazine 32, 10-25. - American Mineralogist (1959), 44, 1324 (abstract).

Harris, P. M. (1965): Pandaite [= bariopyrochlore] from the Mrima Hill niobium deposit (Kenya). Mineralogical Magazine 35, 277-290.

Hogarth, D. D. (1977): Classification and nomenclature of the pyrochlore group. American Mineralogist 62, 403-410, esp. 407.

Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 42

Internet Links for Bariopyrochlore

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    Localities for Bariopyrochlore

    Hide Locality List
    The 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.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Brazil
     
    • Central-West Region
      • Goiás
    		Orris, G.J., and Grauch, R.I. (2002): USGS Open-File Report 02-189.
    Orris, G.J., and Grauch, R.I. (2002): USGS Open-File Report 02-189.
    • Southeast Region
      • Minas Gerais
        • Araxá
    		Orris, G.J., and Grauch, R.I. (2002): USGS Open-File Report 02-189.
        • Tapira
    Democratic Republic of Congo (Zaïre)
     
    • Kivu
    		Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 42
    Kenya
     
    • Coast Province
    		Harris, P. M. (1965): Pandaite [= bariopyrochlore] from the Mrima Hill niobium deposit (Kenya). Mineralogical Magazine 35, 277-290
    Russia
     
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
          • Khibiny Massif
    www.koeln.netsurf.de/~w.steffens/vuori.htm
    Tanzania
     
    • Mbeya Region
      • Amboseli
        • Mbeya
    		Min. Mag. 32, 10-25
    USA
     
    • Wisconsin
      • Marathon Co.
        • Stettin pluton
    		Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 42
    Mineral and/or Locality
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