Bariopyrochlore Mineral Data

Bariopyrochlore Mineral Data +

General Bariopyrochlore Information

Chemical Formula:

(Ba,Sr)(Nb,Ti)2(O,OH)7

Composition:

Molecular Weight = 343.55 gm

Barium 11.99 % Ba 13.39 % BaO

Strontium 5.10 % Sr 6.03 % SrO

Calcium 1.17 % Ca 1.63 % CaO

Titanium 2.79 % Ti 4.65 % TiO₂

Niobium 48.68 % Nb 69.64 % Nb₂O₅

Hydrogen 0.47 % H 4.20 % H₂O

Oxygen 29.81 % O

______ ______

100.00 % 99.53 % = TOTAL OXIDE

Empirical Formula:

Ba_0.3Sr_0.2Ca_0.1Nb_1.8Ti_0.2O_5.6(H₂O)_0.8

Environment:

Contact zone of a highly weathered, biotite-bearing roof pendant in a carbonatite.

IMA Status:

Approved IMA 1977

Locality:

From the Mbeya carbonatite, Panda Hill, near Mbeya, Tanzania. Link to MinDat.org Location Data.

Name Origin:

Assigned by the IMA pyrochlore nomenclature group for the predominant barium content and to pyrochlore.

Synonym:

ICSD 45819

PDF 12-285

Pandaite

Bariopyrochlore Image

Images:

Bariopyrochlore

Comments: Yellow crystalline massive bariopyrochlore.
Location: Catalao #2 Mine, Goias, Brazil. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Bariopyrochlore Crystallography

Cell Dimensions:

a = 10.562, Z = 8; V = 1,178.25 Den(Calc)= 3.87

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F d3m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.044(1), 6.09(0.8), 1.864(0.7),

Physical Properties of Bariopyrochlore

Cleavage:

[111] Indistinct, [111] Indistinct, [111] Indistinct

Color:

Green gray, Yellow gray.

Density:

Diaphaniety:

Transparent to Translucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Hardness:

4.5-5 - Near Apatite

Luster:

Resinous

Streak:

white

Optical Properties of Bariopyrochlore

Gladstone-Dale:

CI meas= -0.097 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.134 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2817,KPDmeas= 0.2725,KC= 0.2485

Optical Data:

Isotropic, n=2.07-2.11.

Calculated Properties of Bariopyrochlore

Electron Density:

r_electron=3.67 gm/cc
note: r_{Bariopyrochlore}=4.00 gm/cc.

Fermion Index

Fermion Index = 0.0287
Boson Index = 0.9713

Photoelectric:

PE_{Bariopyrochlore}= 134.09 barns/electron
U=PE_{Bariopyrochlore} x r_electron= 491.47 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Bariopyrochlore is Not Radioactive

Bariopyrochlore Classification

Dana Class:

8.2.1.3 (8)Multiple Oxides with Nb, Ta, and Ti

(8.2)where (A)2 (B2O6) (O,OH,F)

(8.2.1)Pyrochlore Group (Pyrochlore Subgroup; Nb>Ta;(Nb+Ta)>2(Ti)

8.2.1.1 Pyrochlore (Na,Ca)2Nb2O6(OH,F) F d3m 4/m 3 2/m

8.2.1.2 Kalipyrochlore (H2O,Sr)(Nb,Ti)(O,OH)6·(H2O,K) F d3m 4/m 3 2/m

8.2.1.3 Bariopyrochlore (Ba,Sr)(Nb,Ti)2(O,OH)7 F d3m 4/m 3 2/m

8.2.1.4 Yttropyrochlore-(Y) (Y,Na,Ca,U)1-2(Nb,Ta,Ti)2(O,OH)7 F d3m 2/m 3

8.2.1.5 Ceriopyrochlore-(Ce) (Ce,Ca,Y)2(Nb,Ta)2O6(OH,F) F d3m 4/m 3 2/m

8.2.1.6 Plumbopyrochlore (Pb,Y,U,Ca)2-xNb2O6(OH) F d3m 4/m 3 2/m

8.2.1.7 Uranpyrochlore (U,Ca,Ce)2(Nb,Ta)2O6(OH,F) F d3m 4/m 3 2/m

8.2.1.8 Strontiopyrochlore* Sr2Nb2(O,OH)7 F d3m 4/m 3 2/m

8.2.1.9 Bismutopyrochlore! (Bi,U,Ca,Pb)1x(Nb,Ta)2O6(OH)·n(H2O) F d3m 4/m 3 2/m

Strunz Class:

IV/C.17-50 IV - Oxides

IV/C - Oxides with metal : oxygen = 2:3 (M2O3 and related compounds)

IV/C.17 - Pyrochlore group, Pyrochlore series with Nb > Ti

IV/C.17-10 Pyrochlore (Na,Ca)2Nb2O6(OH,F) F d3m 4/m 3 2/m

IV/C.17-20 Calciobetafite Ca2(Ti,Nb)2(O,OH)7 F d3m 4/m 3 2/m

IV/C.17-30 Kalipyrochlore (H2O,Sr)(Nb,Ti)(O,OH)6·(H2O,K) F d3m 4/m 3 2/m

IV/C.17-40 Strontiopyrochlore* Sr2Nb2(O,OH)7 F d3m 4/m 3 2/m

IV/C.17-50 Bariopyrochlore (Ba,Sr)(Nb,Ti)2(O,OH)7 F d3m 4/m 3 2/m

IV/C.17-60 Yttropyrochlore-(Y) (Y,Na,Ca,U)1-2(Nb,Ta,Ti)2(O,OH)7 F d3m 2/m 3

IV/C.17-70 Ceriopyrochlore-(Ce) (Ce,Ca,Y)2(Nb,Ta)2O6(OH,F) F d3m 4/m 3 2/m

IV/C.17-80 Plumbopyrochlore (Pb,Y,U,Ca)2-xNb2O6(OH) F d3m 4/m 3 2/m

IV/C.17-85 Bismutopyrochlore! (Bi,U,Ca,Pb)1x(Nb,Ta)2O6(OH)·n(H2O) F d3m 4/m 3 2/m

IV/C.17-90 Uranpyrochlore (U,Ca,Ce)2(Nb,Ta)2O6(OH,F) F d3m 4/m 3 2/m

Other Bariopyrochlore Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)

See Also:

Links to other databases for Bariopyrochlore :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 - WWW-MINCRYST 12 -École des Mines de Paris

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Bariopyrochlore

(Ba,Sr)(Nb,Ti)2(O,OH)7
Dana No: 8.2.1.3 Strunz No: IV/C.17-50
Locality:

Notes: