Uranpyrochlore Mineral Data

Uranpyrochlore Mineral Data +

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General Uranpyrochlore Information

Chemical Formula:

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

Composition:

Molecular Weight = 541.23 gm

Calcium 5.18 % Ca 7.25 % CaO

Cerium 20.71 % Ce 24.26 % Ce₂O₃

Uranium 17.59 % U 19.96 % UO₂

Tantalum 16.72 % Ta 20.41 % Ta₂O₅

Niobium 18.88 % Nb 27.01 % Nb₂O₅

Hydrogen 0.17 % H 1.50 % H₂O

Oxygen 20.40 % O

Fluorine 0.35 % F 0.35 % F

- % F -0.15 % -O=F₂

______ ______

100.00 % 100.59 % = TOTAL OXIDE

Empirical Formula:

U_0.4Ca_0.7Ce_0.8Nb_1.1Ta_0.5O₆(OH)_0.9F_0.1

Environment:

Cemented calcareous tuffs associated with carbonatite.

IMA Status:

Approved IMA 1977

Locality:

Kasenda, Fort Portal area, Uganda. Link to MinDat.org Location Data.

Name Origin:

Named for its URANium content and membership in the pyrochlore group.

Synonym:

Hatchettolite

Uranpyrochlore Image

Images:

Click Here for Larger Uranpyrochlore Image

Uranpyrochlore Samarskite-(Y)

Comments: Deep greenish-brown resinous crystalline massive uranpyrochlore with black samarskite-(Y).
Location: Beryl Hill, near Yinnietharra Station, Western Australia, Australia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Uranpyrochlore Crystallography

Cell Dimensions:

a = 10.44, Z = 8; V = 1,137.89 Den(Calc)= 6.32

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): 3.01(1), 1.84(0.8), 1.575(0.6),7.3(0.4), 2.61(0.3), 1.202(0.2), 1.168(0.2),

Physical Properties of Uranpyrochlore

Cleavage:

None

Color:

Yellow brown, Red, Reddish brown, Black.

Density:

4.8

Diaphaniety:

Translucent to Opaque

Fracture:

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

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Habit:

Octahedral Crystals - Occurs as octahedral shaped crystals.

Hardness:

5 - Apatite

Luminescence:

Non-fluorescent.

Luster:

Resinous

Streak:

brownish yellow

Optical Properties of Uranpyrochlore

Gladstone-Dale:

CI meas= -0.143 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.132 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1551,KPDmeas= 0.2042,KC= 0.1786

Optical Data:

Isotropic, n=1.98.

Calculated Properties of Uranpyrochlore

Electron Density:

r_electron=5.51 gm/cc
note: r_{Uranpyrochlore}=6.32 gm/cc.

Fermion Index

Fermion Index = 0.00145
Boson Index = 0.99855

Photoelectric:

PE_{Uranpyrochlore}= 796.68 barns/electron
U=PE_{Uranpyrochlore} x r_electron=4,387.24 barns/cc.

Radioactivity:

GRapi = 1,325,810.86 (Gamma Ray American Petroleum Institute Units)

Uranpyrochlore is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 10 cm box) 22.94 ± 5.74 grams of pure Uranpyrochlore .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 2294.2 ±573.55 grams of pure Uranpyrochlore .

**Estimated Radioactivity from Uranpyrochlore** - very strong
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 / 6.71 cm	31,952,933	8.64E-04	1,325,810.86	435.88
100 gm / 3.11 cm	3,195,293	8.64E-05	132,581.09	43.59
10 gm / 1.45 cm	319,529	8.64E-06	13,258.11	4.36
1 gm / 6.71 mm	31,953	8.64E-07	1,325.81	0.44
0.1 gm / 3.11 mm	3,195	8.64E-08	132.58	0.04
0.01 gm / 1.45 mm	320	8.64E-09	13.26	0.00
0.001 gm / 0.67 mm	32	8.64E-10	1.33	0.00

Weight of pure Uranpyrochlore in grams (gm) and Calculated Diameter of a Sphere with a Density of 6.32 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 ( 1.04 % Th) From Sum REE Elements (20.71 % REE)

Uranpyrochlore Classification

Dana Class:

8.2.1.7 (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

Strunz Class:

IV/C.17-90 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 Uranpyrochlore Information

References:

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

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Uranpyrochlore

(U,Ca,Ce)2(Nb,Ta)2O6(OH,F)
Dana No: 8.2.1.7 Strunz No: IV/C.17-90
Locality:

Notes: