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:
|
|
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 |
X Ray Diffraction: |
By Intensity(I/Io): 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: |
relectron=5.36 gm/cc note: rCerotungstite-(Ce) =6.24 gm/cc. |
Fermion Index |
Fermion Index = 0.08029 Boson Index = 0.91971 |
Photoelectric: |
PECerotungstite-(Ce) = 821.07 barns/electron U=PECerotungstite-(Ce) x relectron=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
Search for Cerotungstite-(Ce) using:
[ALTAVISTA]
[AOL]
[About.com]
[All-The-Web]
[HotBot]
[Ixquick]
[LookSmart]
[MAMMA]
[MSN.COM]
[Netscape]
[Teoma]
[Wikipedia]
[YAHOO]
Visit our Advertisers for Cerotungstite-(Ce) :
AA Mineral Specimens
B and L Minerals
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Minernet.it
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop
Translate Cerotungstite-(Ce) Mineral Data :
Ask about Cerotungstite-(Ce) here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in
Espaņol
Print or Cut-and-Paste your Cerotungstite-(Ce) Specimen Label here :
|
Cerotungstite-(Ce)
CeW2O6(OH)3
Dana No: 49.3.3.1 Strunz No: IV/E.02-80
Locality:
Notes:
|
|
| |
| |
|
| |