Cerotungstite-(Ce) Mineral Data

Cerotungstite-(Ce) Mineral Data

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General Cerotungstite-(Ce) Information

Chemical Formula:

CeW2O6(OH)3

Composition:

Molecular Weight = 654.83 gm

Cerium 21.40 % Ce 25.06 % Ce₂O₃

Hydrogen 0.46 % H 4.13 % H₂O

Tungsten 56.15 % W 70.81 % WO₃

Oxygen 21.99 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CeW₂O₆(OH)₃

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:

Click Here for Larger Cerotungstite-(Ce) Image

Cerotungstite-(Ce) Anthoinite 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)= 6.24

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): 3.41(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= 0.108 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1528,KC= 0.1712

Optical Data:

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

Calculated Properties of Cerotungstite-(Ce)

Electron Density:

r_electron=5.36 gm/cc
note: r_{Cerotungstite-(Ce)}=6.24 gm/cc.

Fermion Index

Fermion Index = 0.08029
Boson Index = 0.91971

Photoelectric:

PE_{Cerotungstite-(Ce)}= 821.07 barns/electron
U=PE_{Cerotungstite-(Ce)} x r_electron=4,397.15 barns/cc.

Radioactivity:

GRapi = 19,587.91 (Gamma Ray American Petroleum Institute Units)

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	479,294	1.30E-05	19,587.91	6.44
100 gm / 3.13 cm	47,929	1.30E-06	1,958.79	0.64
10 gm / 1.45 cm	4,793	1.30E-07	195.88	0.06
1 gm / 6.74 mm	479	1.30E-08	19.59	0.01
0.1 gm / 3.13 mm	48	1.30E-09	1.96	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 6.24 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 ( 1.07 % Th) From Sum REE Elements (21.40 % REE)

Cerotungstite-(Ce) Classification

Dana Class:

49.3.3.1 (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.02-80 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 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 -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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Cerotungstite-(Ce)

CeW2O6(OH)3
Dana No: 49.3.3.1 Strunz No: IV/E.02-80
Locality:

Notes: