Mineralogy Database

Pyrochlore Mineral Data

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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 Name Pronunciation: Name Pronunciation: Pyrochlore + Pronunciation Say PYROCHLORE
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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  Perrierite-(Ce)   Pyrochlore   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 - Hexoctahedral H-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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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 Diaphaneity: Diaphaneity: 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: Non-fluorescent.
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
Ncalc = 2.05 - 2.6
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: Bulk Density (Electron Density)=4.93 gm/cc
note: Specific Gravity of Pyrochlore =5.27 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0002232777
Boson Index = 0.9997767223
Help on Photoelectric: Photoelectric: PEPyrochlore = 80.27 barns/electron
U=PEPyrochlore x rElectron Density= 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: 08.02.01.01 (08)Multiple Oxides with Nb, Ta, and Ti
  (08.02)where (A)2 (B2O6) (O,OH,F)
  (08.02.01)Pyrochlore Group (Pyrochlore Subgroup; Nb>Ta;(Nb+Ta)>2(Ti)
 
08.02.01.01 Pyrochlore (Na,Ca)2Nb2O6(OH,F) F d3m 4/m 3 2/m
 
08.02.01.02 Kalipyrochlore (H2O,Sr)(Nb,Ti)(O,OH)6•(H2O,K) F d3m 4/m 3 2/m
 
08.02.01.03 Bariopyrochlore (Ba,Sr)(Nb,Ti)2(O,OH)7 F d3m 4/m 3 2/m
 
08.02.01.04 Yttropyrochlore-(Y) (Y,Na,Ca,U)1-2(Nb,Ta,Ti)2(O,OH)7 F d3m 2/m 3
 
08.02.01.05 Ceriopyrochlore-(Ce) (Ce,Ca,Y)2(Nb,Ta)2O6(OH,F) F d3m 4/m 3 2/m
 
08.02.01.06 Plumbopyrochlore (Pb,Y,U,Ca)2-xNb2O6(OH) F d3m 4/m 3 2/m
 
08.02.01.07 Uranpyrochlore (U,Ca,Ce)2(Nb,Ta)2O6(OH,F) F d3m 4/m 3 2/m
 
08.02.01.08 Strontiopyrochlore* Sr2Nb2(O,OH)7 F d3m 4/m 3 2/m
 
08.02.01.09 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: 04.DH.15 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.D - Metal:Oxygen = 1:2 and similar
  04.DH -With large (� medium-sized) cations; sheets of edge-sharing octahedra
 
04.DH.15 Alumotungstite (W,Al)(O,OH)3(?) Unk Cubic
 
04.DH.15 Betafite (Ca,U)2(Ti,Nb,Ta)2O6(OH) F d3m 4/m 3 2/m
 
04.DH.15 Ferritungstite (K,Ca,Na)(W,Fe)2(O,OH)6•(H2O) F d3m 4/m 3 2/m
 
04.DH.15 Cesstibtantite (Cs,Na)SbTa4O12 F d3m 4/m 3 2/m
 
04.DH.15 Bismutomicrolite (Bi,Ca)(Ta,Nb)2O6(OH) F d3m 4/m 3 2/m
 
04.DH.15 Ceriopyrochlore-(Ce) (Ce,Ca,Y)2(Nb,Ta)2O6(OH,F) F d3m 4/m 3 2/m
 
04.DH.15 Bariopyrochlore (Ba,Sr)(Nb,Ti)2(O,OH)7 F d3m 4/m 3 2/m
 
04.DH.15 Bariomicrolite Ba(Ta,Nb)2(O,OH)7 F d3m 4/m 3 2/m
 
04.DH.15 Calciobetafite Ca2(Ti,Nb)2(O,OH)7 F d3m 4/m 3 2/m
 
04.DH.15 Jixianite Pb(W,Fe)2(O,OH)7 F d3m 4/m 3 2/m
 
04.DH.15 Plumbomicrolite (Pb,Ca,U)2Ta2O6(OH) F d3m 4/m 3 2/m
 
04.DH.15 Kalipyrochlore (H2O,Sr)(Nb,Ti)(O,OH)6•(H2O,K) F d3m 4/m 3 2/m
 
04.DH.15 Plumbopyrochlore (Pb,Y,U,Ca)2-xNb2O6(OH) F d3m 4/m 3 2/m
 
04.DH.15 Strontiopyrochlore* Sr2Nb2(O,OH)7 F d3m 4/m 3 2/m
 
04.DH.15 Uranmicrolite (U,Ca)2(Ta,Nb)2O6(OH) F d3m 4/m 3 2/m
 
04.DH.15 Pyrochlore (Na,Ca)2Nb2O6(OH,F) F d3m 4/m 3 2/m
 
04.DH.15 Microlite (Na,Ca)2Ta2O6(O,OH,F) F d3m 4/m 3 2/m
 
04.DH.15 Natrobistantite (Na,Cs)Bi(Ta,Nb,Sb)4O12 F d3m 4/m 3 2/m
 
04.DH.15 Plumbobetafite (Pb,U,Ca)(Ti,Nb)2O6(OH,F) F d3m 4/m 3 2/m
 
04.DH.15 Stibiomicrolite (Sb,Ca,Na)2(Ta,Nb)2(O,OH)7 F d3m 4/m 3 2/m
 
04.DH.15 Stannomicrolite (Sn,Fe,Mn)(Ta,Nb,Sn)2(O,OH)7 F d3m 4/m 3 2/m
 
04.DH.15 Stibiobetafite (Sb,Ca)2(Ti,Nb,Ta)2(O,OH)7 F d3m 4/m 3 2/m
 
04.DH.15 Uranpyrochlore (U,Ca,Ce)2(Nb,Ta)2O6(OH,F) F d3m 4/m 3 2/m
 
04.DH.15 Bismutopyrochlore! (Bi,U,Ca,Pb)1x(Nb,Ta)2O6(OH)•n(H2O) F d3m 4/m 3 2/m
 
04.DH.15 Fluornatromicrolite! (Na,Ca,Bi)2Ta2O6F F d3m 4/m 3 2/m
 
04.DH.15 Yttrobetafite-(Y) (Y,U,Ce)2(Ti,Nb,Ta)2O6(OH) F d3m 4/m 3 2/m
 
04.DH.15 Yttropyrochlore-(Y) (Y,Na,Ca,U)1-2(Nb,Ta,Ti)2(O,OH)7 F d3m 2/m 3
 
04.DH.15 Elsmoreite! WO3•0.5(H2O) 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 - EUROmin Project
7 - Ecole des Mines de Paris
8 - GeoScienceWorld
9 - Google Images
10 - Google Scholar
11 - Handbook of Mineralogy (MinSocAm)
12 - Handbook of Mineralogy (UofA)
13 - MinDAT
14 - Mineralienatlas (Deutsch)
15 - Online Mineral Museum
16 - QUT Mineral Atlas
17 - Ruff.Info
18 - WWW-MINCRYST

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Print or Cut-and-Paste your Pyrochlore Specimen Label here :

Pyrochlore

(Na,Ca)2Nb2O6(OH,F)
Dana No: 08.02.01.01 Strunz No: 04.DH.15
Locality:

 

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