Widenmannite Mineral Data

General Widenmannite Information

Chemical Formula:

Pb2(UO2)(CO3)3

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

Empirical Formula:

Pb₂(UO₂)(CO₃)₃

Environment:

Alteration zone mineral.

IMA Status:

Approved IMA 1961

Locality:

Michael mine, Weiler bei Lehr, Schwarzwald, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for Bergrat J. F. Widenmann (1764-1798), who first discovered uranium containing micas in the Schwarzwald.

Name Pronunciation:

Widenmannite + Pronunciation

Widenmannite Image

Images:

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

Axial Ratios:

a:b:c =0.9604:1:0.5288

Cell Dimensions:

a = 8.99, b = 9.36, c = 4.95, Z = 2; V = 416.52 Den(Calc)= 6.89

Crystal System:

Orthorhombic Space Group: Pnnm, Pnm21, or P 22121

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.34(1), 4.16(1), 3.19(0.8),

Physical Properties of Widenmannite

Cleavage:

{100} Perfect

Color:

Light yellow.

Density:

6.89

Fracture:

Fragile - Crystals with a delicate and easily injured structure.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

2 - Gypsum

Luminescence:

Non-fluorescent.

Luster:

Silky - Pearly

Streak:

white

Optical Properties of Widenmannite

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

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

Electron Density:

Bulk Density (Electron Density)=5.77 gm/cc
note: Specific Gravity of Widenmannite =6.89 gm/cc.

Fermion Index:

Fermion Index = 0.1
Boson Index = 0.9

Photoelectric:

PE_Widenmannite=1,624.60 barns/electron
U=PE_Widenmannite x r_electron=9,374.80 barns/cc.

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

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

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

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 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

Search for Widenmannite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Widenmannite :

Ask about Widenmannite 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 Español

Print or Cut-and-Paste your Widenmannite Specimen Label here :

Widenmannite

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

Notes:

Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.