Chadwickite Mineral Data

Chadwickite Mineral Data

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General Chadwickite Information

Chemical Formula:

(UO2)H(AsO3)

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

Empirical Formula:

(UO₂)H(AsO₃)

Environment:

From granite in dump material at the Sophia mine, central Black Forest.

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

Wittichen in the Black Forest, Aufschluss, Germany. Link to MinDat.org Location Data.

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.

Synonym:

ICSD 266

IMA1997-005

PDF 34-1170

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Chadwickite Crystallography

Axial Ratios:

a:c = 1:1.4509

Cell Dimensions:

a = 11, c = 15.96, Z = 14; V = 1,931.16 Den(Calc)= 4.74

Crystal System:

Tetragonal

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

By Intensity(I/I_o): 4.95(1), 3.33(0.8), 5.58(0.8),

Physical Properties of Chadwickite

Cleavage:

[001] Perfect

Color:

Yellow.

Density:

4.86

Diaphaniety:

Translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Hardness:

2 - Gypsum

Luster:

Earthy (Dull)

Streak:

yellow

Optical Properties of Chadwickite

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

Optical Data:

Uniaxial (-), e=1.75, w=1.84, bire=0.0900.

Calculated Properties of Chadwickite

Electron Density:

r_electron=4.10 gm/cc
note: r_Chadwickite=4.86 gm/cc.

Fermion Index

Fermion Index = 0.00444
Boson Index = 0.99556

Photoelectric:

PE_Chadwickite=1,641.17 barns/electron
U=PE_Chadwickite x r_electron=6,721.72 barns/cc.

Radioactivity:

GRapi = 4,340,174.02 (Gamma Ray American Petroleum Institute Units)

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	108,152,248	2.92E-03	4,340,174.02	1,426.91
100 gm / 3.40 cm	10,815,225	2.92E-04	434,017.40	142.69
10 gm / 1.58 cm	1,081,522	2.92E-05	43,401.74	14.27
1 gm / 7.32 mm	108,152	2.92E-06	4,340.17	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

Dana Class:

45.1.15.1 (45)Acid and normal Antimonites, Arsenites and Phosphites

(45.1)with miscellaneous formulae

(45.1.15)Dana Group

45.1.15.1 Chadwickite ! (UO2)H(AsO3) Tetra

Strunz Class:

IV/J.05-10 IV - Oxides

IV/J - Arsenides with [AsO3]3- groups

IV/J.05 - Asbeckasite - Cafarsite series

IV/J.05-10 Chadwickite (UO2)H(AsO3) Tetra

IV/J.05-20 Cafarsite Ca8(Ti,Fe,Fe,Mn)6-7(AsO3)12·4(H2O) P n3 2/m 3

IV/J.05-50 Georgbokiite! Cu5O2(SeO3)2Cl2 P 2₁/c 2/m

IV/J.05-55 Chloromenite! Cu9O2(SeO3)4Cl6 I2/m 2/m

IV/J.05-60 Ilinskite! NaCu5O2(SeO3)2Cl Pbnm 2/m 2/m 2/m

Other Chadwickite Information

References:

NAME( AmMin, Vol. 84, No. 7-8) PHYS. PROP.(Eur. J. Min.,Vol.10,1998) OPTIC PROP.(Eur. J. Min.,Vol.10,1998)

See Also:

Links to other databases for Chadwickite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 - Uranium Minerals

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

Chadwickite

(UO2)H(AsO3)
Dana No: 45.1.15.1 Strunz No: IV/J.05-10
Locality:

Notes: