Mineralogy Database

Chadwickite Mineral Data

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General Chadwickite Information

Help on Chemical  Formula: Chemical Formula: (UO2)H(AsO3)
Help on Composition: Composition: Molecular Weight = 393.96 gm
   Uranium   60.42 %  U    68.54 % UO2
   Arsenic   19.02 %  As   25.11 % As2O3
   Hydrogen   0.26 %  H     2.29 % H2O
   Oxygen    20.31 %  O
            ______        ______ 
            100.00 %       95.94 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: (UO2)H(AsO3)
Help on Environment: Environment: From granite in dump material at the Sophia mine, central Black Forest.
Help on IMA Status: IMA Status: Approved IMA 1998 (Dana # Added)
Help on Locality: Locality: Wittichen in the Black Forest, Aufschluss, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after Sir James Chadwick (1891-1974), English physicist Cavendish Laboratory, University of Cambridge, U.K. 1935 Nobel Prize winner for his discovery of the neutron.
Help on Synonym: Synonym: ICSD 266
  IMA1997-005
  PDF 34-1170
 

Chadwickite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.4509
Help on Cell Dimensions: Cell Dimensions: a = 11, c = 15.96, Z = 14; V = 1,931.16 Den(Calc)= 4.74
Help on Crystal System: Crystal System: Tetragonal
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.95(1), 3.33(0.8), 5.58(0.8),
 

Physical Properties of Chadwickite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Yellow.
Help on Density: Density: 4.86
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Hardness: Hardness: 2 - Gypsum
Help on Luster: Luster: Earthy (Dull)
Help on Streak: Streak: yellow
 

Optical Properties of Chadwickite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.209 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.239 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1677,KPDmeas= 0.1636,KC= 0.1353
Ncalc = 1.64 - 1.66
Help on Optical Data: Optical Data: Uniaxial (-), e=1.75, w=1.84, bire=0.0900.
 

Calculated Properties of Chadwickite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.10 gm/cc
note: Specific Gravity of Chadwickite =4.86 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0044481118
Boson Index = 0.9955518882
Help on Photoelectric: Photoelectric: PEChadwickite =1,641.17 barns/electron
U=PEChadwickite x relectron=6,721.72 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 4,340,175.65 (Gamma Ray American Petroleum Institute Units)
Concentration of Chadwickite per GRapi unit = 230.41 (PPB)

Chadwickite 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) 7.01 ± 1.75 grams of pure Chadwickite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 700.82 ±175.20 grams of pure Chadwickite .

Estimated Radioactivity from Chadwickite - 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 / 7.32 cm 108,152,265 2.92E-03 4,340,175.65 1,426.91
100 gm / 3.40 cm 10,815,227 2.92E-04 434,017.57 142.69
10 gm / 1.58 cm 1,081,523 2.92E-05 43,401.76 14.27
1 gm / 7.32 mm 108,152 2.92E-06 4,340.18 1.43
0.1 gm / 3.40 mm 10,815 2.92E-07 434.02 0.14
0.01 gm / 1.58 mm 1,082 2.92E-08 43.40 0.01
0.001 gm / 0.73 mm 108 2.92E-09 4.34 0.00

Weight of pure Chadwickite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.86 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
 

Chadwickite Classification

Help on  Dana Class: Dana Class: 45.01.15.01 (45)Acid and normal Antimonites, Arsenites and Phosphites
  (45.01)with miscellaneous formulae
  (45.01.15)Dana Group
 
45.01.15.01 Chadwickite! (UO2)H(AsO3) Tetra
Help on  Strunz Class: Strunz Class: 04.JA.60 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.J - Arsenites, Antimonites, Bismuthites, Sulfites,
  04.JA -Arsenites, antimonites, bismuthites; without additional anions, without H2O
 
04.JA.60 Chadwickite! (UO2)H(AsO3) Tetra
 

Other Chadwickite Information

Help on References: References: NAME( AmMin, Vol. 84, No. 7-8) PHYS. PROP.(Eur. J. Min.,Vol.10,1998) OPTIC PROP.(Eur. J. Min.,Vol.10,1998)
Help on See Also: See Also: Links to other databases for Chadwickite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (UofA)
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info
12 - Uranium Minerals

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

Chadwickite

(UO2)H(AsO3)
Dana No: 45.01.15.01 Strunz No: 04.JA.60
Locality:

 

Notes:

 

 
   
 


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