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Sklodowskite Mineral Data

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General Sklodowskite Information

Help on Chemical  Formula: Chemical Formula: (H3O)2Mg(UO2)2(SiO4)2•4(H2O)
Help on Composition: Composition: Molecular Weight = 858.63 gm
   Magnesium   2.83 %  Mg    4.69 % MgO
   Uranium    55.44 %  U    62.90 % UO2
   Silicon     6.54 %  Si   14.00 % SiO2
   Hydrogen    1.64 %  H    14.69 % H2O
   Oxygen     33.54 %  O
             ______        ______ 
             100.00 %       96.27 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: (H3O)2Mg(UO2)2(SiO4)2•4(H2O)
Help on Environment: Environment: Oxidation zones of uranium ores, often associated with altered uraninite and with other secondary uranium minerals.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1924
Help on Locality: Locality: Kasolo, Katanga, Congo. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Marie Curie-Sklodowska (1867 - 1934), Polish-born French researcher of radioactive minerals. Discoverd the element radium.
Help on Name Pronunciation: Name Pronunciation: Sklodowskite + Pronunciation Say SKLODOWSKITE
Help on Synonym: Synonym: Chinkolobwite
  ICSD 1148
  PDF 29-875

Sklodowskite Image

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Comments: Yellow cotton-ball spray of acicular sklodowskite.
Location: Shinkolobwe mine, Tantara, Shaba, Democratic Republic of the Congo. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

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  Sklodowskite   Kasolite

Comments: Greenish yellow, acicular sklodowskite crystals and yellow, bladed kasolite crystals.
Location: Kambove, (Kakanda) Mine, Katanga District, Shaba (Katanga), Republic of the Congo, (Zaïre). Scale: Picture size 1 cm.
© Paul M. Schumacher

Sklodowskite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.458:1:0.9331
Help on Cell Dimensions: Cell Dimensions: a = 17.28, b = 7.03, c = 6.56, Z = 2; beta = 105.88° V = 766.49 Den(Calc)= 3.72
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 8.42(1), 4.19(0.8), 3.27(0.7),

Physical Properties of Sklodowskite

Help on Cleavage: Cleavage: {100} Perfect
Help on Color: Color: Greenish yellow, Light yellow.
Help on Density: Density: 3.54
Help on Diaphaneity: Diaphaneity: Translucent to subtranslucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 2-3 - Gypsum-Calcite
Help on Luminescence: Luminescence: Radioactive.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: yellow white

Optical Properties of Sklodowskite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.185 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.128 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1707,KPDmeas= 0.1794,KC= 0.1513
Ncalc = 1.54 - 1.56
Help on Optical Data: Optical Data: Biaxial (+), a=1.613, b=1.635, g=1.657, bire=0.0440
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): pale yellow.
Help on Pleochroism (z): Pleochroism (z): yellow.

Calculated Properties of Sklodowskite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.31 gm/cc
note: Specific Gravity of Sklodowskite =3.72 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PESklodowskite =1,414.09 barns/electron
U=PESklodowskite x relectron=4,680.63 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 4,205,043.13 (Gamma Ray American Petroleum Institute Units)
Concentration of Sklodowskite per GRapi unit = 237.81 (PPB)

Sklodowskite 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) 7.23 ± 1.81 grams of pure Sklodowskite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 723.34 ±180.83 grams of pure Sklodowskite .

Estimated Radioactivity from Sklodowskite - very strong
Curies (Ci)
If Held in Hand
For One Hour
1000 gm / 8.01 cm 99,244,067 2.68E-03 4,205,043.13 1,382.48
100 gm / 3.72 cm 9,924,407 2.68E-04 420,504.31 138.25
10 gm / 1.73 cm 992,441 2.68E-05 42,050.43 13.82
1 gm / 8.01 mm 99,244 2.68E-06 4,205.04 1.38
0.1 gm / 3.72 mm 9,924 2.68E-07 420.50 0.14
0.01 gm / 1.73 mm 992 2.68E-08 42.05 0.01
0.001 gm / 0.80 mm 99 2.68E-09 4.21 0.00

Weight of pure Sklodowskite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.72 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

Sklodowskite Classification

Help on  Dana Class: Dana Class: (53)Nesosilicate Insular SiO4 Groups and Other Anions of Complex Cations
  (53.03)with (UO2)
  (53.03.01)Uranophane group Kasolite Pb(UO2)SiO4•(H2O) P 21/a 2/m Uranophane Ca(UO2)2SiO3(OH)2•5(H2O) P 21 2 Sklodowskite (H3O)2Mg(UO2)2(SiO4)2•4(H2O) C 2/m 2/m Cuprosklodowskite Cu[(UO2)(SiO2OH)]2•6(H2O) P1 1 Boltwoodite HK(UO2)(SiO4)•1.5(H2O) P 21 2 Natroboltwoodite (H3O)(Na,K)(UO2)SiO4•(H2O) P 212121 2 2 2 Oursinite (Co,Mg)(H3O)2[(UO2)SiO4]2•3(H2O) Aba2,Abam Ortho Swamboite UH6(UO2)6(SiO4)6•30(H2O) P 21/a 2/m Uranophane-beta Ca[(UO2)SiO3(OH)]2•(H2O) P 21/a 2/m
Help on  Strunz Class: Strunz Class: 09.AK.10 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AK -Uranyl neso- and polysilicates
09.AK.10 Cuprosklodowskite Cu[(UO2)(SiO2OH)]2•6(H2O) P1 1
09.AK.10 Oursinite (Co,Mg)(H3O)2[(UO2)SiO4]2•3(H2O) Aba2,Abam Ortho
09.AK.10 Sklodowskite (H3O)2Mg(UO2)2(SiO4)2•4(H2O) C 2/m 2/m

Other Sklodowskite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Sklodowskite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - Uranium Minerals

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Dana No: Strunz No: 09.AK.10





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