Strontiopyrochlore Mineral Data

Strontiopyrochlore Mineral Data

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General Strontiopyrochlore Information

Chemical Formula:

Sr2Nb2(O,OH)7

Composition:

Molecular Weight = 475.06 gm

Strontium 36.89 % Sr 43.62 % SrO

Niobium 39.11 % Nb 55.95 % Nb₂O₅

Hydrogen 0.42 % H 3.79 % H₂O

Oxygen 23.57 % O

______ ______

100.00 % 103.37 % = TOTAL OXIDE

Empirical Formula:

Sr₂Nb₂O₅(OH)₂

IMA Status:

Not Approved IMA 1986

Locality:

Link to MinDat.org Location Data.

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Strontiopyrochlore Crystallography

Cell Dimensions:

a = 10.53, Z = 6; V = 1,167.58 Den(Calc)= 4.05

Crystal System:

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

Physical Properties of Strontiopyrochlore

Color:

Light brown, Light yellow.

Density:

3.8

Diaphaniety:

Translucent to Opaque

Hardness:

4 - Fluorite

Luster:

Vitreous - Resinous

Streak:

white

Optical Properties of Strontiopyrochlore

Gladstone-Dale:

CI meas= -0.257 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.179 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2667,KPDmeas= 0.2842,KC= 0.2261

Optical Data:

Isotropic, n=2.08.

Calculated Properties of Strontiopyrochlore

Electron Density:

r_electron=3.68 gm/cc
note: r_{Strontiopyrochlore}=4.05 gm/cc.

Fermion Index

Fermion Index = 0.02593
Boson Index = 0.97407

Photoelectric:

PE_{Strontiopyrochlore}= 103.64 barns/electron
U=PE_{Strontiopyrochlore} x r_electron= 381.70 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Strontiopyrochlore is Not Radioactive

Strontiopyrochlore Classification

Dana Class:

8.2.1.8 (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.17-40 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 Strontiopyrochlore Information

References:

PHYS. PROP.(Am.Min.,Vol.73,p930,1988) OPTIC PROP.(Am.Min.,Vol.73,p930,1988)

See Also:

Links to other databases for Strontiopyrochlore :
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 -École des Mines de Paris

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Strontiopyrochlore

Sr2Nb2(O,OH)7
Dana No: 8.2.1.8 Strunz No: IV/C.17-40
Locality:

Notes: