Ceriopyrochlore-(Ce) Mineral Data

General Ceriopyrochlore-(Ce) Information

Chemical Formula:

(Ce,Ca,Y)2(Nb,Ta)2O6(OH,F)

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

Empirical Formula:

Ce_1.2Ca_0.6Y_0.2Nb_0.8Ta_0.8Zr_0.1Fe²⁺_0.1O_6.2(OH)_0.75F_0.25

Environment:

In pegmatites related to alkalic igneous rocks and in nepheline syenites.

IMA Status:

Approved IMA 1977

Locality:

From Wasau, Marathon County, Wisconsin, USA. Link to MinDat.org Location Data.

Name Origin:

From the similarity to pyrochlore and the cerium content.

Synonym:

Marignacite

Ceriopyrochlore-(Ce) Image

Images:

Ceriopyrochlore-(Ce)

Comments: Dark-brown granular aggregate of compact ceriopyrochlore-(Ce) with fine-granular aggregate of more light-brown zircon.
Location: Katugin Ta-Nb deposit (Katuginskoye deposit), Chitinskaya Oblast', Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia. Scale: FOV is 8x5 cm.
© Pavel M. Kartashov

Ceriopyrochlore-(Ce) Crystallography

Cell Dimensions:

a = 10.55, Z = 14; V = 1,174.24 Den(Calc)= 11.10

Crystal System:

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

Physical Properties of Ceriopyrochlore-(Ce)

Cleavage:

None

Color:

Resin brown, Light brown, Dark brown.

Density:

4.13

Diaphaneity:

Transparent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Metamict - Mineral originally crystalline, now amorphous due to radiation damage.

Hardness:

5-5.5 - Apatite-Knife Blade

Luster:

Resinous

Streak:

yellowish brown

Optical Properties of Ceriopyrochlore-(Ce)

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)

Electron Density:

Bulk Density (Electron Density)=9.74 gm/cc
note: Specific Gravity of Ceriopyrochlore-(Ce) =11.1 gm/cc.

Fermion Index:

Fermion Index = 0.0022218449
Boson Index = 0.9977781551

Photoelectric:

PE_{Ceriopyrochlore-(Ce)}= 490.06 barns/electron
U=PE_{Ceriopyrochlore-(Ce)} x r_electron=4,771.39 barns/cc.

Radioactivity:

GRapi = 28,068.60 (Gamma Ray American Petroleum Institute Units)
Concentration of Ceriopyrochlore-(Ce) per GRapi unit = 35.63 (PPM)

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	672,003	1.82E-05	28,068.60	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

Dana Class:

08.02.01.05 (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 Ceriopyrochlore-(Ce) Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Ceriopyrochlore-(Ce) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Ceriopyrochlore-(Ce)

(Ce,Ca,Y)2(Nb,Ta)2O6(OH,F)
Dana No: 08.02.01.05 Strunz No: 04.DH.15
Locality:

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