Mineralogy Database

Widenmannite Mineral Data

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General Widenmannite Information

Help on Chemical  Formula: Chemical Formula: Pb2(UO2)(CO3)3
Help on Composition: Composition: Molecular Weight = 864.46 gm
   Uranium  27.54 %  U    31.24 % UO2
   Lead     47.94 %  Pb   51.64 % PbO
   Carbon    4.17 %  C    15.27 % CO2
   Oxygen   20.36 %  O
           ______        ______ 
           100.00 %       98.15 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Pb2(UO2)(CO3)3
Help on Environment: Environment: Alteration zone mineral.
Help on IMA Status: IMA Status: Approved IMA 1961
Help on Locality: Locality: Michael mine, Weiler bei Lehr, Schwarzwald, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Bergrat J. F. Widenmann (1764-1798), who first discovered uranium containing micas in the Schwarzwald.
Help on Name Pronunciation: Name Pronunciation: Widenmannite + Pronunciation Say WIDENMANNITE
 

Widenmannite Image

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  Widenmannite

Comments: Cotton ball aggregates of tan to colorless acicular crystals of widenmannite on matrix.
Location: Pribram, Bohemia, Czechoslovakia. Scale: See Image.
© Rruff Database

Widenmannite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9604:1:0.5288
Help on Cell Dimensions: Cell Dimensions: a = 8.99, b = 9.36, c = 4.95, Z = 2; V = 416.52 Den(Calc)= 6.89
Help on Crystal System: Crystal System: Orthorhombic Space Group: Pnnm, Pnm21, or P 22121
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.34(1), 4.16(1), 3.19(0.8),
 

Physical Properties of Widenmannite

Help on Cleavage: Cleavage: {100} Perfect
Help on Color: Color: Light yellow.
Help on Density: Density: 6.89
Help on Fracture: Fracture: Fragile - Crystals with a delicate and easily injured structure.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 2 - Gypsum
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Silky - Pearly
Help on Streak: Streak: white
 

Optical Properties of Widenmannite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.029 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.029 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1284,KPDmeas= 0.1284,KC= 0.1321
Ncalc = 1.91
Help on Optical Data: Optical Data: Biaxial (-), a=1.803, b=1.905, g=1.945, bire=0.1420, 2V(Calc)=60, 2V(Meas)=63.
 

Calculated Properties of Widenmannite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.77 gm/cc
note: Specific Gravity of Widenmannite =6.89 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.1
Boson Index = 0.9
Help on Photoelectric: Photoelectric: PEWidenmannite =1,624.60 barns/electron
U=PEWidenmannite x relectron=9,374.80 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 1,965,698.53 (Gamma Ray American Petroleum Institute Units)
Concentration of Widenmannite per GRapi unit = 508.73 (PPB)

Widenmannite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 10 cm box) 15.47 ± 3.87 grams of pure Widenmannite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 1547.4 ±386.84 grams of pure Widenmannite .

Estimated Radioactivity from Widenmannite - very strong
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 / 6.52 cm 49,287,885 1.33E-03 1,965,698.53 646.26
100 gm / 3.03 cm 4,928,789 1.33E-04 196,569.85 64.63
10 gm / 1.40 cm 492,879 1.33E-05 19,656.99 6.46
1 gm / 6.52 mm 49,288 1.33E-06 1,965.70 0.65
0.1 gm / 3.03 mm 4,929 1.33E-07 196.57 0.06
0.01 gm / 1.40 mm 493 1.33E-08 19.66 0.01
0.001 gm / 0.65 mm 49 1.33E-09 1.97 0.00

Weight of pure Widenmannite in grams (gm) and Calculated Diameter of a Sphere with a Density of 6.89 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
 

Widenmannite Classification

Help on  Dana Class: Dana Class: 14.01.05.01 (14)Anhydrous Carbonates
  (14.01)with Simple Formula A+ CO3
  (14.01.05)Dana Group
 
14.01.05.01 Widenmannite Pb2(UO2)(CO3)3 Pnnm, Pnm21, or P 22121 Ortho
Help on  Strunz Class: Strunz Class: 05.ED.40 05 - CARBONATES (NITRATES)
  05.E - Uranyl Carbonates
  05.ED -UO2:CO3 = 1:3
 
05.ED.40 Widenmannite Pb2(UO2)(CO3)3 Pnnm, Pnm21, or P 22121 Ortho
 

Other Widenmannite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Widenmannite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - Uranium Minerals

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Widenmannite

Pb2(UO2)(CO3)3
Dana No: 14.01.05.01 Strunz No: 05.ED.40
Locality:

 

Notes:

 

 
   
 


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