Pyrochlore Mineral Data

TESCAN Integrated Mineral Analyzer (TIMA)
Fully automated, high throughput, analytical scanning electron microscope
Designed specifically for the mining and minerals processing industry

General Pyrochlore Information

Chemical Formula:

(Na,Ca)2Nb2O6(OH,F)

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

Empirical Formula:

Na_1.5Ca_0.5Nb₂O₆(OH)_0.75F_0.25

Environment:

Nepheline-syenite rocks.

IMA Status:

Valid Species (Pre-IMA) 1826

Locality:

Fredriksvarn and Larvik, Norway. Link to MinDat.org Location Data.

Name Origin:

From the Greek pyr - "fire" and chloros - "green."

Name Pronunciation:

Pyrochlore + Pronunciation

Synonym:

ICSD 27815

PDF 17-746

Pyrochlore Image

Images:

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

Images:

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

Cell Dimensions:

a = 10.37, Z = 10; V = 1,115.16 Den(Calc)= 5.27

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(1), 1.838(0.6), 1.568(0.5),

Forms:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize
Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu
Help on Above

Forms: ( 1 1 1) ( 0 1 1)

Warning: this large pop-up is very compute intensive and may not work well with some computers.

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Cleavage:

{111} Indistinct, {111} Indistinct, {111} Indistinct

Color:

Brown, Yellowish brown, Yellow, Greenish brown, Reddish brown.

Density:

4.2 - 6.4, Average = 5.3

Diaphaneity:

Subtranslucent to opaque

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Disseminated - Occurs in small, distinct particles dispersed in matrix.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

5-5.5 - Apatite-Knife Blade

Luminescence:

Non-fluorescent.

Luster:

Resinous - Greasy

Streak:

yellowish brown

Optical Properties of Pyrochlore

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

Optical Data:

Isotropic, n=1.9-2.2.

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

Electron Density:

Bulk Density (Electron Density)=4.93 gm/cc
note: Specific Gravity of Pyrochlore =5.27 gm/cc.

Fermion Index:

Fermion Index = 0.0002232777
Boson Index = 0.9997767223

Photoelectric:

PE_Pyrochlore= 80.27 barns/electron
U=PE_Pyrochlore x rElectron Density= 395.72 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Pyrochlore is Not Radioactive

Pyrochlore Classification

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

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

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)

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

Search for Pyrochlore using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Pyrochlore :

B and L Fine Minerals
Dakota Matrix Minerals
Dan & Diana Weinrich Mineral Auctions
Excalibur Mineral Corp.
Exceptional Minerals
John Betts Fine Minerals
Mineral News
Mineral of the Month Club
NY/NJ Gem & Mineral Show
TIMA Mineral Analyzer
Weinrich Minerals, Inc.
Wright's Rock Shop

Ask about Pyrochlore here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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:

Notes: