Yttrotungstite-(Ce) Mineral Data

General Yttrotungstite-(Ce) Information

Chemical Formula:

(Ce,Nd,Y)W2O6(OH)3

Composition:

Molecular Weight = 643.06 gm

Cerium 10.89 % Ce 12.76 % Ce₂O₃

Yttrium 3.46 % Y 4.39 % Y₂O₃

Hydrogen 0.47 % H 4.20 % H₂O

Tungsten 57.18 % W 72.11 % WO₃

Neodymium 5.61 % Nd 6.54 % Nd₂O₃

Oxygen 22.39 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ce_0.5Nd_0.25Y_0.25W₂O₆(OH)₃

IMA Status:

Approved IMA 1987 (Dana # Added)

Locality:

Link to MinDat.org Location Data.

Name Origin:

Named for its composition (Yttrium, Tungsen).

Name Pronunciation:

Yttrotungstite-(Ce) + Pronunciation

Yttrotungstite-(Ce) Crystallography

Axial Ratios:

a:b:c =0.6751:1:0.8126

Cell Dimensions:

a = 5.874, b = 8.7, c = 7.07, Z = 2; beta = 105.45° V = 348.25 Den(Calc)= 6.13

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2₁/m

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

By Intensity(I/I_o): 3.045(1), 2.273(0.52), 6.83(0.36),

Physical Properties of Yttrotungstite-(Ce)

Color:

Yellow.

Density:

5.96

Hardness:

1 - Talc

Optical Properties of Yttrotungstite-(Ce)

Gladstone-Dale:

CI meas= 0.072 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.098 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1555,KPDmeas= 0.16,KC= 0.1724
Ncalc = 2.03 - 2.06

Optical Data:

Biaxial (?), a=1.89, b=1.95, g=2.02, bire=0.1300

Calculated Properties of Yttrotungstite-(Ce)

Electron Density:

Bulk Density (Electron Density)=5.13 gm/cc
note: Specific Gravity of Yttrotungstite-(Ce) =5.96 gm/cc.

Fermion Index:

Fermion Index = 0.09
Boson Index = 0.91

Photoelectric:

PE_{Yttrotungstite-(Ce)}= 814.11 barns/electron
U=PE_{Yttrotungstite-(Ce)} x r_electron=4,176.30 barns/cc.

Radioactivity:

GRapi = 15,150.53 (Gamma Ray American Petroleum Institute Units)
Concentration of Yttrotungstite-(Ce) per GRapi unit = 66.00 (PPM)

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

**Estimated Radioactivity from Yttrotungstite-(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 / 6.84 cm	369,643	9.99E-06	15,150.53	4.98
100 gm / 3.18 cm	36,964	9.99E-07	1,515.05	0.50
10 gm / 1.47 cm	3,696	9.99E-08	151.51	0.05
1 gm / 6.84 mm	370	9.99E-09	15.15	0.00
0.1 gm / 3.18 mm	37	9.99E-10	1.52	0.00
0.01 gm / 1.47 mm	4	9.99E-11	0.15	0.00
0.001 gm / 0.68 mm	0	9.99E-12	0.02	0.00

Weight of pure Yttrotungstite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 5.96 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 ( 0.83 % Th) From Sum REE Elements (16.50 % REE)

Yttrotungstite-(Ce) Classification

Dana Class:

49.03.03.03 (49)Basic and Hydrated Molybdates and Tungstates

(49.03)(Hydrated, containing Hydroxyl or Halogen)

(49.03.03)Yttrotungstite Group

49.03.03.01 Cerotungstite-(Ce) (Ce,REE)W2O6(OH)3 P 2₁/m 2/m

49.03.03.02 Yttrotungstite-(Y) YW2O6(OH)3 P 2₁/m 2/m

49.03.03.03 Yttrotungstite-(Ce)! (Ce,Nd,Y)W2O6(OH)3 P 2₁/m 2/m

Strunz Class:

04.FD.20 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.F - Hydroxides (without V or U)

04.FD -Hydroxides with OH, without H2O; chains of edge-sharing octahedra

04.FD.20 Cerotungstite-(Ce) (Ce,REE)W2O6(OH)3 P 2₁/m 2/m

04.FD.20 Yttrotungstite-(Ce)! (Ce,Nd,Y)W2O6(OH)3 P 2₁/m 2/m

04.FD.20 Yttrotungstite-(Y) YW2O6(OH)3 P 2₁/m 2/m

Other Yttrotungstite-(Ce) Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

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

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Yttrotungstite-(Ce)

(Ce,Nd,Y)W2O6(OH)3
Dana No: 49.03.03.03 Strunz No: 04.FD.20
Locality:

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