Mineralogy Database

Ursilite Mineral Data

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General Ursilite Information

Help on Chemical  Formula: Chemical Formula: (Mg,Ca)4[(UO2)4(OH)5/(Si2O5)5.5]•13(H2O)
Help on Composition: Composition: Molecular Weight = 2,261.26 gm
   Calcium     1.77 %  Ca    2.48 % CaO
   Magnesium   3.22 %  Mg    5.35 % MgO
   Uranium    42.11 %  U    47.77 % UO2
   Silicon    13.66 %  Si   29.23 % SiO2
   Hydrogen    1.38 %  H    12.35 % H2O
   Oxygen     37.85 %  O
             ______        ______ 
             100.00 %       97.17 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg3Ca(UO2)4(OH)5(Si2O5)5.5•13(H2O)
Help on Environment: Environment: Oxidized zone oI a uranium-coal deposit in fractures in the coal 20-50 m. below the surface. Both Ca and Mg dominant forms are present.
Help on IMA Status: IMA Status: Not Approved IMA - Published 1957
Help on Locality: Locality: Not Stated. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the composition (U, Si).
 

Ursilite Crystallography

Help on Crystal System: Crystal System: Orthorhombic Space Group: Unk
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.06(1), 4.98(1), 2.07(0.9),2.3(0.9), 3.37(0.8), 4.58(0.8), 1.798(0.6), 1.981(0.6), 2.42(0.6),
 

Physical Properties of Ursilite

Help on Color: Color: Green, Pale green.
Help on Density: Density: 3.03 - 3.254, Average = 3.14
Help on Hardness: Hardness: 2-3 - Gypsum-Calcite
Help on Luminescence: Luminescence: Fluorescent, Short UV=medium yellow green.
Help on Streak: Streak: light yellow
 

Optical Properties of Ursilite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.05 (Good) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.1748,KC= 0.1664
Ncalc = 1.5 - 1.54
Help on Optical Data: Optical Data: Biaxial (-), a=1.543-1.548, g=1.55-1.556, bire=0.0070-0.0080
Help on Pleochroism (x): Pleochroism (x): pale green.
Help on Pleochroism (z): Pleochroism (z): green.
 

Calculated Properties of Ursilite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.88 gm/cc
note: Specific Gravity of Ursilite =3.14 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEUrsilite =1,042.45 barns/electron
U=PEUrsilite x relectron=3,004.12 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 3,291,773.62 (Gamma Ray American Petroleum Institute Units)
Concentration of Ursilite per GRapi unit = 303.79 (PPB)

Ursilite 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) 9.24 ± 2.31 grams of pure Ursilite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 924.02 ±231.01 grams of pure Ursilite .

Estimated Radioactivity from Ursilite - 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 / 8.47 cm 75,368,801 2.04E-03 3,291,773.62 1,082.23
100 gm / 3.93 cm 7,536,880 2.04E-04 329,177.36 108.22
10 gm / 1.83 cm 753,688 2.04E-05 32,917.74 10.82
1 gm / 8.47 mm 75,369 2.04E-06 3,291.77 1.08
0.1 gm / 3.93 mm 7,537 2.04E-07 329.18 0.11
0.01 gm / 1.83 mm 754 2.04E-08 32.92 0.01
0.001 gm / 0.85 mm 75 2.04E-09 3.29 0.00

Weight of pure Ursilite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.14 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
 

Ursilite Classification

Help on  Dana Class: Dana Class: 51.00.00.00 (51)Nesosilicate Minerals
  (51.00)Without Dana Classification Numbers
  (51.00.00)Uranyl nesosilicate
 
51.00.00.00 Hydrougrandite? (Ca,Mg,Fe)3(Fe,Al)2(SiO4)3-x(OH)4x I a3d 4/m 3 2/m
 
51.00.00.00 Ursilite* (Mg,Ca)4[(UO2)4(OH)5/(Si2O5)5.5]•13(H2O) Unk Ortho
Help on  Strunz Class: Strunz Class: 09.AK.35 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AK -Uranyl neso- and polysilicates
 
09.AK.35 Ursilite* (Mg,Ca)4[(UO2)4(OH)5/(Si2O5)5.5]•13(H2O) Unk Ortho
 

Other Ursilite Information

Help on References: References: NAME( AmMin,v44:464) PHYS. PROP.(AmMin,v44:464) OPTIC PROP.(AmMin,v44:464)
Help on See Also: See Also: Links to other databases for Ursilite :
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 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - Uranium Minerals

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

Ursilite

(Mg,Ca)4[(UO2)4(OH)5/(Si2O5)5.5]•13(H2O)
Dana No: 51.00.00.00 Strunz No: 09.AK.35
Locality:

 

Notes:

 

 
   
 


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