Yttrotungstite-(Ce) Mineral Data

Yttrotungstite-(Ce) Mineral Data +

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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).

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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 - PrismaticH-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

Optical Data:

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

Calculated Properties of Yttrotungstite-(Ce)

Electron Density:

r_electron=5.13 gm/cc
note: r_{Yttrotungstite-(Ce)}=5.96 gm/cc.

Fermion Index

Fermion Index = 0.09324
Boson Index = 0.90676

Photoelectric:

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

Radioactivity:

GRapi = 15,150.48 (Gamma Ray American Petroleum Institute Units)

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	369,642	9.99E-06	15,150.48	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	151.50	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:

49.3.3.3 (49)Basic and Hydrated Molybdates and Tungstates

(49.3)(Hydrated, containing Hydroxyl or Halogen)

(49.3.3)Dana Group

49.3.3.1 Cerotungstite-(Ce) CeW2O6(OH)3 P 2₁/m 2/m

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

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

Strunz Class:

IV/E.02-75 IV - Oxides

IV/E - Oxides with metal : oxygen < 1:2 (M2O5, MO3)

IV/E.02 - Tungstite - Cerotungstite-(Ce) series

IV/E.02-10 Tungstite WO3·(H2O) Pmnb 2/m 2/m 2/m

IV/E.02-20 Meymacite WO3·2(H2O) None

IV/E.02-30 Hydrotungstite H2WO4·(H2O) P 2/m 2/m

IV/E.02-40 Alumotungstite (W,Al)(O,OH)3(?) Unk Cubic

IV/E.02-50 Anthoinite AlWO3(OH)3 P1 or P1 Tri

IV/E.02-60 Mpororoite Al(WO3)(OH)3·2(H2O) P1 or P1 Tri

IV/E.02-70 Yttrotungstite-(Y) YW2O6(OH)3 P 2₁/m 2/m

IV/E.02-75 Yttrotungstite-(Ce) (Ce,Nd,Y)W2O6(OH)3 P 2₁/m 2/m

IV/E.02-80 Cerotungstite-(Ce) CeW2O6(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 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Yttrotungstite-(Ce)

(Ce,Nd,Y)W2O6(OH)3
Dana No: 49.3.3.3 Strunz No: IV/E.02-75
Locality:

Notes: