Yttropyrochlore-(Y) Mineral Data

Yttropyrochlore-(Y) Mineral Data +

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General Yttropyrochlore-(Y) Information

Chemical Formula:

(Y,Na,Ca,U)1-2(Nb,Ta,Ti)2(O,OH)7

Composition:

Molecular Weight = 455.99 gm

Sodium 1.01 % Na 1.36 % Na₂O

Calcium 1.76 % Ca 2.46 % CaO

Yttrium 13.65 % Y 17.33 % Y₂O₃

Uranium 10.44 % U 11.84 % UO₂

Tantalum 19.84 % Ta 24.23 % Ta₂O₅

Titanium 2.10 % Ti 3.50 % TiO₂

Niobium 24.45 % Nb 34.98 % Nb₂O₅

Iron 1.22 % Fe 1.75 % Fe₂O₃

Hydrogen 0.62 % H 5.53 % H₂O

Oxygen 24.91 % O

______ ______

100.00 % 102.98 % = TOTAL OXIDE

Empirical Formula:

Y_0.7Na_0.2Ca_0.2U_0.2Nb_1.2Ta_0.5Ti_0.2Fe³⁺_0.1O_5.4(OH)_0.6·1.1(H₂O)

Environment:

Replacement zones in a pegmatite.

IMA Status:

Approved IMA 1977

Locality:

Alakurtti, northwestern Karelia, Russia. Link to MinDat.org Location Data.

Name Origin:

Named as the YTTRium-dominent member ot the pyrochlore group.

Synonym:

Obruchevite

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Yttropyrochlore-(Y) Crystallography

Cell Dimensions:

a = 10.2, Z = 6; V = 1,061.21 Den(Calc)= 4.28

Crystal System:

Isometric - DiploidalH-M Symbol (2/m 3) Space Group: F d3m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.95(1), 3.02(1), 3.09(0.25),

Physical Properties of Yttropyrochlore-(Y)

Cleavage:

None

Color:

Dark brown, Black.

Density:

3.6 - 3.8, Average = 3.7

Diaphaniety:

Translucent to Opaque

Fracture:

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

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Habit:

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

Hardness:

4.5-5.5 - Near Apatite

Luminescence:

Radioactive.

Luster:

Resinous

Streak:

light brown

Optical Properties of Yttropyrochlore-(Y)

Gladstone-Dale:

CI meas= -0.035 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.106 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1945,KPDmeas= 0.225,KC= 0.2175

Optical Data:

Isotropic, n=1.83-1.835.

Calculated Properties of Yttropyrochlore-(Y)

Electron Density:

r_electron=3.31 gm/cc
note: r_{Yttropyrochlore-(Y)}=3.70 gm/cc.

Fermion Index

Fermion Index = 0.00389
Boson Index = 0.99611

Photoelectric:

PE_{Yttropyrochlore-(Y)}= 550.09 barns/electron
U=PE_{Yttropyrochlore-(Y)} x r_electron=1,822.89 barns/cc.

Radioactivity:

GRapi = 797,004.66 (Gamma Ray American Petroleum Institute Units)

Yttropyrochlore-(Y) 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) 38.16 ± 9.54 grams of pure Yttropyrochlore-(Y) .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 3816.4 ±954.09 grams of pure Yttropyrochlore-(Y) .

**Estimated Radioactivity from Yttropyrochlore-(Y)** - 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 / 8.02 cm	18,687,600	5.05E-04	797,004.66	262.03
100 gm / 3.72 cm	1,868,760	5.05E-05	79,700.47	26.20
10 gm / 1.73 cm	186,876	5.05E-06	7,970.05	2.62
1 gm / 8.02 mm	18,688	5.05E-07	797.00	0.26
0.1 gm / 3.72 mm	1,869	5.05E-08	79.70	0.03
0.01 gm / 1.73 mm	187	5.05E-09	7.97	0.00
0.001 gm / 0.80 mm	19	5.05E-10	0.80	0.00

Weight of pure Yttropyrochlore-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.70 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

Yttropyrochlore-(Y) Classification

Dana Class:

8.2.1.4 (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.17-60 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 Yttropyrochlore-(Y) Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(AntBidBlaNic3) OPTIC PROP.(AntBidBlaNic3)

See Also:

Links to other databases for Yttropyrochlore-(Y) :
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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Yttropyrochlore-(Y)

(Y,Na,Ca,U)1-2(Nb,Ta,Ti)2(O,OH)7
Dana No: 8.2.1.4 Strunz No: IV/C.17-60
Locality:

Notes: