Cerotungstite-(Ce) Mineral Data

General Cerotungstite-(Ce) Information

Chemical Formula:

(Ce,REE)W2O6(OH)3

Composition:

Molecular Weight = 655.80 gm

Cerium 16.02 % Ce 18.77 % Ce₂O₃

La,Ce,Pr,Nd,Sm, 5.49 % RE 6.40 % REE₂O₃

Hydrogen 0.46 % H 4.12 % H₂O

Tungsten 56.07 % W 70.71 % WO₃

Oxygen 21.96 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ce_0.75REE_0.25W₂O₆(OH)₃

Environment:

In oxidized tungsten deposits.

IMA Status:

Approved IMA 1970

Locality:

Kirwa and Nyamulilo mines, Kigezi district, Uganda. Link to MinDat.org Location Data.

Name Origin:

Named for the composition.

Cerotungstite-(Ce) Image

Images:

Anthoinite Cerotungstite-(Ce) Ferberite

Comments: Yellow cerotungstite-(Ce), with black ferberite veins and whitish anthoinite.
Location: Bugarama, Rwanda. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Cerotungstite-(Ce) Crystallography

Axial Ratios:

a:b:c =0.8126:1:0.6751

Cell Dimensions:

a = 7.07, b = 8.7, c = 5.874, Z = 2; beta = 105.45° V = 348.25 Den(Calc)= 6.25

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): 3.41(1), 2.27(0.5), 6.83(0.4),1.767(0.2), 2.63(0.2), 3.34(0.2),

Physical Properties of Cerotungstite-(Ce)

Cleavage:

{100} Perfect

Color:

Yellow orange, Orange yellow.

Habit:

Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

1 - Talc

Streak:

yellow

Optical Properties of Cerotungstite-(Ce)

Gladstone-Dale:

CI calc= 0.104 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1525,KC= 0.1703
Ncalc = 2.06

Optical Data:

Biaxial (+/-), a=1.89, b=1.95, g=2.02, bire=0.1300

Calculated Properties of Cerotungstite-(Ce)

Electron Density:

Bulk Density (Electron Density)=5.37 gm/cc
note: Specific Gravity of Cerotungstite-(Ce) =6.25 gm/cc.

Fermion Index:

Fermion Index = 0.09
Boson Index = 0.91

Photoelectric:

PE_{Cerotungstite-(Ce)}= 826.38 barns/electron
U=PE_{Cerotungstite-(Ce)} x r_electron=4,437.91 barns/cc.

Radioactivity:

GRapi = 19,735.86 (Gamma Ray American Petroleum Institute Units)
Concentration of Cerotungstite-(Ce) per GRapi unit = 50.67 (PPM)

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

**Estimated Radioactivity from Cerotungstite-(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 / 6.74 cm	482,343	1.30E-05	19,735.86	6.49
100 gm / 3.13 cm	48,234	1.30E-06	1,973.59	0.65
10 gm / 1.45 cm	4,823	1.30E-07	197.36	0.06
1 gm / 6.74 mm	482	1.30E-08	19.74	0.01
0.1 gm / 3.13 mm	48	1.30E-09	1.97	0.00
0.01 gm / 1.45 mm	5	1.30E-10	0.20	0.00
0.001 gm / 0.67 mm	0	1.30E-11	0.02	0.00

Weight of pure Cerotungstite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 6.25 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 ( 1.08 % Th) From Sum REE Elements (21.51 % REE)

Cerotungstite-(Ce) Classification

Dana Class:

49.03.03.01 (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 Cerotungstite-(Ce) Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Cerotungstite-(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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Cerotungstite-(Ce)

(Ce,REE)W2O6(OH)3
Dana No: 49.03.03.01 Strunz No: 04.FD.20
Locality:

Notes:

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