Pyrochlore Mineral Data + Say PYROCHLORE

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General Pyrochlore Information
Help on Chemical Formula: Chemical Formula: (Na,Ca)2Nb2O6(OH,F)
Help on Composition: Composition: Molecular Weight = 353.84 gm
   Sodium     9.75 %  Na   13.14 % Na2O
   Calcium    5.66 %  Ca    7.92 % CaO
   Niobium   52.51 %  Nb   75.12 % Nb2O5
   Hydrogen   0.21 %  H     1.91 % H2O
   Oxygen    30.52 %  O
   Fluorine   1.34 %  F     1.34 % F
               -   %  F    -0.57 % -O=F2
            ______        ______ 
            100.00 %       98.87 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na1.5Ca0.5Nb2O6(OH)0.75F0.25
Help on Environment: Environment: Nepheline-syenite rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1826
Help on Locality: Locality: Fredriksvarn and Larvik, Norway. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek pyr - "fire" and chloros - "green."
Help on Synonym: Synonym: ICSD 27815
  PDF 17-746
 

Pyrochlore Image

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Pyrochlore

Comments: Deep brownish black crystals of pyrochlore to 0.9 cm across.
Location: Lauzon Farm, Oka, Quebec, Canada. Scale: 3.9 x 2.9 cm.
© John Veevaert
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Pyrochlore   Perrierite-(Ce)   Zircon   Loparite-(Ce)

Comments: Reddish black perrierite crystal, with orange-brown pyrochlore crystal, yellow-brown zircon, and grayish-black loparite.
Location: Buer, Bjorkedalen, Langesundfjord, Telemark, Norway. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Pyrochlore Crystallography
Help on Cell Dimensions: Cell Dimensions: a = 10.37, Z = 10; V = 1,115.16 Den(Calc)= 5.27
Help on Crystal System: 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/Io): 3(1), 1.838(0.6), 1.568(0.5),
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Forms: [ 1 1 1] [ 0 1 1]

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Bonazzi P , Bindi L , Zoppi M , Capitani G C , Olmi F , American Mineralogist , 91 (2006) p.794-801, Single-crystal diffraction and transmission electron microscopy studies, of silicified pyrochlore from Narssarssk, Julianehaab district, Greenland, Locality: Narssarssk, Julianehaab district, Greenland, Sample: 396a

View Additional jPOWD Structure files for Pyrochlore
[1] [2] [3] [4] [5] [6]
 

Physical Properties of Pyrochlore

Help on Cleavage: Cleavage: [111] Indistinct, [111] Indistinct, [111] Indistinct
Help on Color: Color: Brown, Yellowish brown, Yellow, Greenish brown, Reddish brown.
Help on Density: Density: 4.2 - 6.4, Average = 5.3
Help on Diaphaniety: Diaphaniety: Subtranslucent to opaque
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Disseminated - Occurs in small, distinct particles dispersed in matrix.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Hardness: Hardness: 5-5.5 - Apatite-Knife Blade
Help on Luminescence: Luminescence: None.
Help on Luster: Luster: Resinous - Greasy
Help on Streak: Streak: yellowish brown
 

Optical Properties of Pyrochlore

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.208 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.203 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1992,KPDmeas= 0.1981,KC= 0.2501
Help on Optical Data: Optical Data: Isotropic, n=1.9-2.2.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Pyrochlore in Air
λ R  ∑ R(λ) 
 400 nm   11.30   
 420 nm   11.20 
 440 nm   11.10 
 460 nm   11.00 
 480 nm   11.00 
 500 nm   10.90 
 520 nm   10.80 
 540 nm   10.70 
 560 nm   10.60 
 580 nm   10.50 
 600 nm   10.50 
 620 nm   10.40 
 640 nm   10.40 
 660 nm   10.40 
 680 nm   10.40 
 700 nm   10.40 
Calculated Relative Intensity Colors of Pyrochlore in Air
Relative
Intensity		    0%   90% 100% 180% 270% 360% 450% 540% 630% 720% 810% 830%
R                        
 

Calculated Properties of Pyrochlore

Help on Electron Density: Electron Density:

relectron=4.93 gm/cc
note: rPyrochlore =5.27 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.00022
Boson Index = 0.99978
Help on Photoelectric: Photoelectric:

PEPyrochlore = 80.27 barns/electron
U=PEPyrochlore x relectron= 395.72 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Pyrochlore is Not Radioactive
 

Pyrochlore Classification
Help on Dana Class: Dana Class: 8.2.1.1 (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
Help on Strunz Class: Strunz Class: IV/C.17-10 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 Pyrochlore Information
Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Pyrochlore :
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 - Amethyst Galleries' Mineral Gallery 5 -Athena 6 - Crocoite.com Mineral Locations 7 - EUROmin Project 8 -Google Images 9 -Google Scholar 10 -Handbook of Mineralogy (UofA) 11 -MinDAT 12 -MinMax(Deutsch) 13 -MinMax(English) 14 -Mineralienatlas (Deutsch) 15 - Minerals of Wisconsin 16 -QUT Mineral Atlas 17 - WWW-MINCRYST 18 -École des Mines de Paris

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Pyrochlore

(Na,Ca)2Nb2O6(OH,F)
Dana No: 8.2.1.1 Strunz No: IV/C.17-10
Locality:

 

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