Ceriopyrochlore-(Ce) Mineral Data

General Ceriopyrochlore-(Ce) Information
Help on Chemical Formula: Chemical Formula: (Ce,Ca,Y)2(Nb,Ta)2O6(OH,F)
Help on Composition: Composition: Molecular Weight = 560.46 gm
   Calcium     4.29 %  Ca    6.00 % CaO
   Cerium     30.00 %  Ce   35.14 % Ce2O3
   Yttrium     3.17 %  Y     4.03 % Y2O3
   Zirconium   1.63 %  Zr    2.20 % ZrO2
   Tantalum   25.83 %  Ta   31.54 % Ta2O5
   Niobium    13.26 %  Nb   18.97 % Nb2O5
   Iron        1.00 %  Fe    1.28 % FeO
   Hydrogen    0.13 %  H     1.21 % H2O
   Oxygen     19.84 %  O
   Fluorine    0.85 %  F     0.85 % F
                -   %  F    -0.36 % -O=F2
             ______        ______ 
             100.00 %      100.86 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ce1.2Ca0.6Y0.2Nb0.8Ta0.8Zr0.1Fe2+0.1O6.2(OH)0.75F0.25
Help on Environment: Environment: In pegmatites related to alkalic igneous rocks and in nepheline syenites.
Help on IMA Status: IMA Status: Approved IMA 1977
Help on Locality: Locality: From Wasau, Marathon County, Wisconsin, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the similarity to pyrochlore and the cerium content.
Help on Synonym: Synonym: Marignacite
 

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Ceriopyrochlore-(Ce) Crystallography
Help on Cell Dimensions: Cell Dimensions: a = 10.55, Z = 14; V = 1,174.24 Den(Calc)= 11.10
Help on Crystal System: Crystal System: Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F d3m
 

Physical Properties of Ceriopyrochlore-(Ce)

Help on Cleavage: Cleavage: None
Help on Color: Color: Resin brown, Light brown, Dark brown.
Help on Density: Density: 4.13
Help on Diaphaniety: Diaphaniety: Transparent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Metamict - Mineral originally crystalline, now amorphous due to radiation damage.
Help on Hardness: Hardness: 5-5.5 - Apatite-Knife Blade
Help on Luster: Luster: Resinous
Help on Streak: Streak: yellowish brown
 

Optical Properties of Ceriopyrochlore-(Ce)

Help on Optical Data: Optical Data: NCalc= 3 - from Gladstone-Dale relationship (KC = 0.1801) where Ncalc=Dcalc*KC+1
NCalc= 1.74 - from Gladstone-Dale relationship (KC = 0.1801) where Ncalc=Dmeas*KC+1
 

Calculated Properties of Ceriopyrochlore-(Ce)

Help on Electron Density: Electron Density:

relectron=9.74 gm/cc
note: rCeriopyrochlore-(Ce) =11.1 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.00222
Boson Index = 0.99778
Help on Photoelectric: Photoelectric:

PECeriopyrochlore-(Ce) = 490.06 barns/electron
U=PECeriopyrochlore-(Ce) x relectron=4,771.39 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 28,068.55 (Gamma Ray American Petroleum Institute Units)

Ceriopyrochlore-(Ce) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Radioactivity from Ceriopyrochlore-(Ce) - weak
Specimen
Size
Weight/Volume
(Sphere) *		 Calculated
Activity
Bequerols
(Bq)		 Calculated
Activity
Curies (Ci)		 Estimated
Activity
GR(api)		 Estimated
Exposure
(mRem**)/hr
If Held in Hand
For One Hour
1000 gm / 5.56 cm 672,002 1.82E-05 28,068.55 9.23
100 gm / 2.58 cm 67,200 1.82E-06 2,806.86 0.92
10 gm / 1.20 cm 6,720 1.82E-07 280.69 0.09
1 gm / 5.56 mm 672 1.82E-08 28.07 0.01
0.1 gm / 2.58 mm 67 1.82E-09 2.81 0.00
0.01 gm / 1.20 mm 7 1.82E-10 0.28 0.00
0.001 gm / 0.56 mm 1 1.82E-11 0.03 0.00

Weight of pure Ceriopyrochlore-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 11.10 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem
Estimated Thorium Activity ( 1.50 % Th) From Sum REE Elements (30.00 % REE)
 

Ceriopyrochlore-(Ce) Classification
Help on Dana Class: Dana Class: 8.2.1.5 (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.17-70 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 Ceriopyrochlore-(Ce) Information
Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Ceriopyrochlore-(Ce) :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas

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Print or Cut-and-Paste your Ceriopyrochlore-(Ce) Specimen Label here :

Ceriopyrochlore-(Ce)

(Ce,Ca,Y)2(Nb,Ta)2O6(OH,F)
Dana No: 8.2.1.5 Strunz No: IV/C.17-70
Locality:

 

Notes:

 
 
   
 
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