Mineralogy Database

Uranosilite Mineral Data

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General Uranosilite Information

Help on Chemical  Formula: Chemical Formula: (U++++++O2)Si7O15
Help on Composition: Composition: Molecular Weight = 706.62 gm
   Uranium  33.69 %  U    38.21 % UO2
   Silicon  27.82 %  Si   59.52 % SiO2
   Oxygen   38.49 %  O
           ______        ______ 
           100.00 %       97.74 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: (UO2)Si7O15
Help on IMA Status: IMA Status: Approved IMA 1983
Help on Locality: Locality: Menzeschwand, Schwarzwald, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named in allusion to the composition.
Help on Name Pronunciation: Name Pronunciation: Uranosilite + Pronunciation Say URANOSILITE
 

Uranosilite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7901:1:0.8739
Help on Cell Dimensions: Cell Dimensions: a = 11.6, b = 14.68, c = 12.83, Z = 6; V = 2,184.80 Den(Calc)= 3.22
Help on Crystal System: Crystal System: Orthorhombic - Disphenoidal H-M Symbol (2 2 2) Space Group: P 22121
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 7.3(1), 6.19(0.9), 11.58(0.9),
 

Physical Properties of Uranosilite

Help on Cleavage: Cleavage: None
Help on Color: Color: Yellowish white.
Help on Density: Density: 3.25
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Uranosilite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.096 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.106 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1792,KPDmeas= 0.1775,KC= 0.162
Ncalc = 1.52 - 1.53
Help on Optical Data: Optical Data: Biaxial (-), a=1.57, g=1.584, bire=0.0140
 

Calculated Properties of Uranosilite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.00 gm/cc
note: Specific Gravity of Uranosilite =3.25 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEUranosilite = 829.41 barns/electron
U=PEUranosilite x relectron=2,487.24 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 2,649,369.98 (Gamma Ray American Petroleum Institute Units)
Concentration of Uranosilite per GRapi unit = 377.45 (PPB)

Uranosilite 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) 11.48 ± 2.87 grams of pure Uranosilite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 1148.1 ±287.02 grams of pure Uranosilite .

Estimated Radioactivity from Uranosilite - 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 / 8.38 cm 60,297,390 1.63E-03 2,649,369.98 871.03
100 gm / 3.89 cm 6,029,739 1.63E-04 264,937.00 87.10
10 gm / 1.80 cm 602,974 1.63E-05 26,493.70 8.71
1 gm / 8.38 mm 60,297 1.63E-06 2,649.37 0.87
0.1 gm / 3.89 mm 6,030 1.63E-07 264.94 0.09
0.01 gm / 1.80 mm 603 1.63E-08 26.49 0.01
0.001 gm / 0.84 mm 60 1.63E-09 2.65 0.00

Weight of pure Uranosilite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.25 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
 

Uranosilite Classification

Help on  Dana Class: Dana Class: 53.03.03.02 (53)Nesosilicate Insular SiO4 Groups and Other Anions of Complex Cations
  (53.03)with (UO2)
  (53.03.03)Other uranyl sillicates
 
53.03.03.01 Soddyite (UO2)2SiO4•2(H2O) F ddd 2/m 2/m 2/m
 
53.03.03.02 Uranosilite (UO2)Si7O15 P 22121 2 2 2
Help on  Strunz Class: Strunz Class: 09.AK.40 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AK -Uranyl neso- and polysilicates
 
09.AK.40 Uranosilite (UO2)Si7O15 P 22121 2 2 2
 

Other Uranosilite Information

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

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

Uranosilite

(U++++++O2)Si7O15
Dana No: 53.03.03.02 Strunz No: 09.AK.40
Locality:

 

Notes: