Soddyite Mineral Data + Say SODDYITE


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General Soddyite Information
Help on Chemical Formula: Chemical Formula: (UO2)2SiO4·2(H2O)
Help on Composition: Composition: Molecular Weight = 668.17 gm
   Uranium   71.25 %  U    80.83 % UO2
   Silicon    4.20 %  Si    8.99 % SiO2
   Hydrogen   0.60 %  H     5.39 % H2O
   Oxygen    23.95 %  O
            ______        ______ 
            100.00 %       95.21 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: (UO2)2(SiO4)·2(H2O)
Help on Environment: Environment: Mixed with curite in oxidized uranium ores.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1922
Help on Locality: Locality: Shinkolobwe, Shaba, Democratic Republic of the Congo (Zaire). Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Frederick Soddy (1877-1956), British radiochemist and physicist.
Help on Synonym: Synonym: ICSD 66313
  PDF 35-491
 

Soddyite Image

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Soddyite

Comments: Yellow crystals of soddyite.
Location: Swambo mine, Mindingi, Shaba, Democratic Republic of the Congo. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals
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Soddyite

Comments: Blocky, tabular crystals of yellow soddyite.
Location: Swambo (Kambove), Shaba (Katanga), Congo (Za?re). Scale: Picture size 2 mm.
© Paul M. Schumacher

Soddyite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.7421:1:1.669
Help on Cell Dimensions: Cell Dimensions: a = 8.32, b = 11.21, c = 18.71, Z = 8; V = 1,745.03 Den(Calc)= 5.09
Help on Crystal System: Crystal System: Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: F ddd
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.57(1), 3.36(0.9), 6.28(0.9),
Click Here for Large Soddyite Structure Window Crystal Structure:

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Demartin F , Gramaccioli C M , Pilati T , Acta Crystallographica, Section C , 48 (1992) p.1-4, The importance of accurate crystal structure determination, of uranium minerals. II. Soddyite (UO2)2(SiO4)*2H2O, Locality: Democratic Republic of the Congo

 

Physical Properties of Soddyite

Help on Cleavage: Cleavage: [001] Perfect, [111] Good
Help on Color: Color: Yellow, Canary yellow, Yellowish green, Yellow.
Help on Density: Density: 4.627
Help on Diaphaniety: Diaphaniety: Transparent to translucent
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Pyramidal - Crystals are shaped like pyramids.
Help on Habit: Habit: Striated - Parallel lines on crystal surface or cleavage face.
Help on Hardness: Hardness: 3-4 - Calcite-Fluorite
Help on Luminescence: Luminescence: Fluorescent and radioactive.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: yellow
 

Optical Properties of Soddyite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.249 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.136 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1339,KPDmeas= 0.1473,KC= 0.1179
Help on Optical Data: Optical Data: Biaxial (-), a=1.65-1.654, b=1.685, g=1.699-1.715, bire=0.0490-0.0610
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): pale yellow.
Help on Pleochroism (z): Pleochroism (z): pale yellow green.
 

Calculated Properties of Soddyite

Help on Electron Density: Electron Density:

relectron=4.30 gm/cc
note: rSoddyite =5.09 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.0072
Boson Index = 0.9928
Help on Photoelectric: Photoelectric:

PESoddyite =1,915.19 barns/electron
U=PESoddyite x relectron=8,228.52 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 5,126,248.43 (Gamma Ray American Petroleum Institute Units)

Soddyite 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) 5.93 ± 1.48 grams of pure Soddyite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 593.35 ±148.34 grams of pure Soddyite .

Estimated Radioactivity from Soddyite - 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 / 7.21 cm 127,534,099 3.45E-03 5,126,248.43 1,685.34
100 gm / 3.35 cm 12,753,410 3.45E-04 512,624.84 168.53
10 gm / 1.55 cm 1,275,341 3.45E-05 51,262.48 16.85
1 gm / 7.21 mm 127,534 3.45E-06 5,126.25 1.69
0.1 gm / 3.35 mm 12,753 3.45E-07 512.62 0.17
0.01 gm / 1.55 mm 1,275 3.45E-08 51.26 0.02
0.001 gm / 0.72 mm 128 3.45E-09 5.13 0.00

Weight of pure Soddyite in grams (gm) and Calculated Diameter of a Sphere with a Density of 5.09 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
 

Soddyite Classification
Help on Dana Class: Dana Class: 53.3.3.1 (53)Nesosilicate Insular SiO4 Groups and Other Anions of Complex Cations
  (53.3)with (UO2)
  (53.3.3)Other uranyl sillicates
 
53.3.3.1 Soddyite (UO2)2SiO4·2(H2O) F ddd 2/m 2/m 2/m
 
53.3.3.2 Uranosilite (UO2)Si7O15 P 22121 2 2 2
Help on Strunz Class: Strunz Class: VIII/B.36-10 VIII - Silicates
  VIII/B - Nesosub-silicates. "Insel" silicates with anions unfamiliar to tetraheders. Uranyl-"Insel" silicates with [UO2]2+ - [SiO4]4-
  VIII/B.36 - Soddyite - Swamboite series
 
VIII/B.36-10 Soddyite (UO2)2SiO4·2(H2O) F ddd 2/m 2/m 2/m
 
VIII/B.36-20 Swamboite UH6(UO2)6(SiO4)6·30(H2O) P 21/a 2/m
 
VIII/B.36-163 Kintoreite PbFe3(PO4)2(OH,H2O)6 R 3m 3 2/m
 
VIII/B.36-165 Segnitite PbFe3H(AsO4)2(OH)6 R 3m 3 2/m
 

Other Soddyite Information
Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Soddyite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (MinSocAm) 8 -Handbook of Mineralogy (UofA) 9 -MinDAT 10 -MinMax(Deutsch) 11 -MinMax(English) 12 -Mineralienatlas (Deutsch) 13 -QUT Mineral Atlas 14 - Uranium Minerals 15 - WWW-MINCRYST 16 -École des Mines de Paris

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Soddyite

(UO2)2SiO4·2(H2O)
Dana No: 53.3.3.1 Strunz No: VIII/B.36-10
Locality:

 

Notes:

 
 
   
 
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