Cuprosklodowskite Mineral Data

Cuprosklodowskite Mineral Data +

General Cuprosklodowskite Information

Chemical Formula:

Cu[(UO2)(SiO2OH)]2·6(H2O)

Composition:

Molecular Weight = 861.84 gm

Uranium 55.24 % U 62.66 % UO₂

Copper 7.37 % Cu 9.23 % CuO

Silicon 6.52 % Si 13.94 % SiO₂

Hydrogen 1.17 % H 10.45 % H₂O

Oxygen 29.70 % O

______ ______

100.00 % 96.29 % = TOTAL OXIDE

Empirical Formula:

Cu(UO₂)₂(SiO₄)₂(H₃O)₂·2(H₂O)

Environment:

A secondary mineral formed by alteration of earlier uranium minerals, both in situ and after transport of solutions.

IMA Status:

Valid Species (Pre-IMA) 1933

Locality:

Kalongwe deposit, Western area, Shaba Cu belt, Shaba, Zaïre. Link to MinDat.org Location Data.

Name Origin:

A name supplied by Buttgenbach while introducing Vaes' paper, in the mistaken belief that it was the copper analog of sklodowskite.

Synonym:

ICSD 4350

Jachimovite

Jachymovite

PDF 19-413

Cuprosklodowskite Image

Images:

Cuprosklodowskite

Comments: Very-fine, acicular crystals of apple green cuprosklodowskite on matrix.
Location: Musonoi Mine, Katanga, Democratic Republic of the Congo. Scale: Not Given.
© John Veevaert

Images:

Cuprosklodowskite

Comments: Green, acicular cuprosklodowskite crystals.
Location: Mashamba West Mine, Kolwezi, Shaba (Katanga), Congo (Za?re). Scale: Picture size 3 mm.
© Paul M. Schumacher

Cuprosklodowskite Crystallography

Axial Ratios:

a:b:c =0.7609:1:0.7181

Cell Dimensions:

a = 7.052, b = 9.267, c = 6.655, Z = 1; alpha = 109.23°, beta = 89.84°, gamma = 110.01° V = 385.85 Den(Calc)= 3.71

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 8.16(1), 4.82(0.9), 6.06(0.7),

Crystal Structure:

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Rosenzweig A , Ryan R R , American Mineralogist , 60 (1975) p.448-453, Refinement of the crystal structure of cuprosklodowskite,, Cu[(UO2)2(SiO3OH)2]*6(H2O)

Physical Properties of Cuprosklodowskite

Cleavage:

[100] Good

Color:

Grass green, Green yellow, Light green.

Density:

3.8

Diaphaniety:

Transparent to Translucent

Fracture:

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

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

4 - Fluorite

Luster:

Vitreous - Silky

Streak:

greenish yellow

Optical Properties of Cuprosklodowskite

Gladstone-Dale:

CI meas= -0.219 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.248 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1784,KPDmeas= 0.1742,KC= 0.1429

Optical Data:

Biaxial (-), a=1.654-1.655, b=1.664-1.667, g=1.664-1.667, bire=0.0100-0.0120, 2V(Calc)=0, 2V(Meas)=0-5.

Calculated Properties of Cuprosklodowskite

Electron Density:

r_electron=3.34 gm/cc
note: r_{Cuprosklodowskite}=3.80 gm/cc.

Fermion Index

Fermion Index = 0.00716
Boson Index = 0.99284

Photoelectric:

PE_{Cuprosklodowskite}=1,428.72 barns/electron
U=PE_{Cuprosklodowskite} x r_electron=4,774.97 barns/cc.

Radioactivity:

GRapi = 4,140,993.70 (Gamma Ray American Petroleum Institute Units)

Cuprosklodowskite 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) 7.35 ± 1.84 grams of pure Cuprosklodowskite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 734.53 ±183.63 grams of pure Cuprosklodowskite .

**Estimated Radioactivity from Cuprosklodowskite** - 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 / 7.95 cm	98,874,373	2.67E-03	4,140,993.70	1,361.42
100 gm / 3.69 cm	9,887,437	2.67E-04	414,099.37	136.14
10 gm / 1.71 cm	988,744	2.67E-05	41,409.94	13.61
1 gm / 7.95 mm	98,874	2.67E-06	4,140.99	1.36
0.1 gm / 3.69 mm	9,887	2.67E-07	414.10	0.14
0.01 gm / 1.71 mm	989	2.67E-08	41.41	0.01
0.001 gm / 0.80 mm	99	2.67E-09	4.14	0.00

Weight of pure Cuprosklodowskite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.80 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

Cuprosklodowskite Classification

Dana Class:

53.3.1.4 (53)Nesosilicate Insular SiO4 Groups and Other Anions of Complex Cations

(53.3)with (UO2)

(53.3.1)Uranophane group

53.3.1.1 Kasolite Pb(UO2)SiO4·(H2O) P 2₁/a 2/m

53.3.1.2 Uranophane Ca(UO2)2SiO3(OH)2·5(H2O) P 2₁ 2

53.3.1.3 Sklodowskite (H3O)2Mg(UO2)2(SiO4)2·4(H2O) C 2/m 2/m

53.3.1.4 Cuprosklodowskite Cu[(UO2)(SiO2OH)]2·6(H2O) P1 1

53.3.1.5 Boltwoodite HK(UO2)(SiO4)·1.5(H2O) P 2₁ 2

53.3.1.6 Sodium-boltwoodite (H3O)(Na,K)(UO2)SiO4·(H2O) P 2₁2₁2₁ 2 2 2

53.3.1.7 Oursinite (Co,Mg)(H3O)2[(UO2)SiO4]2·3(H2O) Aba2,Abam Ortho

53.3.1.8 Swamboite UH6(UO2)6(SiO4)6·30(H2O) P 2₁/a 2/m

53.3.1.9 Uranophane-beta Ca[(UO2)SiO3(OH)]2·(H2O) P 2₁/a 2/m

Strunz Class:

VIII/B.34-20 VIII - Silicates

VIII/B - Nesosub-silicates. "Insel" silicates with anions unfamiliar to tetraheders. Uranyl-"Insel" silicates with [UO2]2+ - [SiO4]4-

VIII/B.34 - Sklodowskite - Uranophane - Kasolite series

VIII/B.34-10 Sklodowskite (H3O)2Mg(UO2)2(SiO4)2·4(H2O) C 2/m 2/m

VIII/B.34-20 Cuprosklodowskite Cu[(UO2)(SiO2OH)]2·6(H2O) P1 1

VIII/B.34-30 Oursinite (Co,Mg)(H3O)2[(UO2)SiO4]2·3(H2O) Aba2,Abam Ortho

VIII/B.34-40 Uranophane Ca(UO2)2SiO3(OH)2·5(H2O) P 2₁ 2

VIII/B.34-50 Uranophane-beta Ca[(UO2)SiO3(OH)]2·(H2O) P 2₁/a 2/m

VIII/B.34-60 Boltwoodite HK(UO2)(SiO4)·1.5(H2O) P 2₁ 2

VIII/B.34-70 Sodium-boltwoodite (H3O)(Na,K)(UO2)SiO4·(H2O) P 2₁2₁2₁ 2 2 2

VIII/B.34-80 Kasolite Pb(UO2)SiO4·(H2O) P 2₁/a 2/m

Other Cuprosklodowskite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Cuprosklodowskite

Cu[(UO2)(SiO2OH)]2·6(H2O)
Dana No: 53.3.1.4 Strunz No: VIII/B.34-20
Locality:

Notes: