Mineralogy Database

Uraninite Mineral Data

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General Uraninite Information

Help on Chemical  Formula: Chemical Formula: UO2
Help on Composition: Composition: Molecular Weight = 270.03 gm
   Uranium  88.15 %  U   100.00 % UO2
   Oxygen   11.85 %  O
           ______        ______ 
           100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: UO2
Help on Environment: Environment: Granite and syenite pegmatites. Colloform crusts in high temperature hydrothermal veins. In quartz-pebble conglomerates.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1772
Help on Locality: Locality: Southern parts of the Canadian Precambrian Shield, Bancroft, Ontario. New Hampshire, USA. Transvaal gold-bearing conglomerates. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From its elemental composition containing uranium.
Help on Name Pronunciation: Name Pronunciation: Uraninite + Pronunciation Say URANINITE
Help on Synonym: Synonym: Broggerite - Th bearing
  Gummite
  ICSD 29085
  PDF 41-1422
 

Uraninite Image

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  Uraninite   Uranophane

Comments: Sharp, cubic crystals of black uraninite on yellow uranophane.
Location: Teofilo Otoni, Minas Gerais, Brazil. Scale: Picture size 1.5 mm.
© Paul M. Schumacher

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  Uraninite

Comments: Polished slab of black "gummite" ore with the uraninite altering to various secondary uranium minerals in a brecciated matrix.
Location: Ruggles mine, Graton, New Hampshire, USA. Scale: Specimen size 11.4 cm.
© Paul M. Schumacher

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  Uraninite

Comments: Black uraninite impregnating coaly wood fragments. You can see the woody structure in detail preserved in the uraninite.
Location: Grants mineral district, Westwater Canyon Member of the Morrison Formation.. Scale: Picture size 5 mm.
© Paul M. Schumacher

Uraninite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 5.4682, Z = 4; V = 163.51 Den(Calc)= 10.97
Help on Crystal System: Crystal System: Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F m3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.157(1), 1.934(0.49), 2.735(0.48),
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Physical Properties of Uraninite

Help on Cleavage: Cleavage: {???} Good
Help on Color: Color: Brownish black, Gray, Grayish black, Black.
Help on Density: Density: 6.5 - 10.95, Average = 8.72
Help on Diaphaneity: Diaphaneity: Nearly opaque
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Botryoidal - "Grape-like" rounded forms (e.g.. malachite).
Help on Habit: Habit: Crystalline - Coarse - Occurs as well-formed coarse sized crystals.
Help on Habit: Habit: Dendritic - Branching "tree-like" growths of great complexity (e.g. pyrolusite).
Help on Hardness: Hardness: 5-6 - Between Apatite and Orthoclase
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Sub Metallic
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: brownish black
 

Optical Properties of Uraninite

Help on Optical Data: Optical Data: NCalc= 2.1 - from Gladstone-Dale relationship (KC = 0.1) where Ncalc=Dcalc*KC+1
NCalc= 1.87 - from Gladstone-Dale relationship (KC = 0.1) where Ncalc=Dmeas*KC+1
Help on RL Color: RL Color: Light gray with brownish tint, may show dark brwon internal reflections.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Uraninite in Air
λ R  ∑ R(λ) 
 400 nm   17.60   
 420 nm   17.30 
 440 nm   17.00 
 460 nm   16.80 
 480 nm   16.50 
 500 nm   16.30 
 520 nm   16.20 
 540 nm   16.00 
 560 nm   15.90 
 580 nm   15.80 
 600 nm   15.90 
 620 nm   15.90 
 640 nm   16.00 
 660 nm   16.00 
 680 nm   16.10 
 700 nm   16.20 
Calculated Relative Intensity Colors of Uraninite in Air
Relative
Intensity
   0%   60% 100% 120% 180% 240% 300% 360% 420% 480% 540% 550%
R                        
 

Calculated Properties of Uraninite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=8.78 gm/cc
note: Specific Gravity of Uraninite =11.0 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0064036671
Boson Index = 0.9935963329
Help on Photoelectric: Photoelectric: PEUraninite =2,500.07 barns/electron
U=PEUraninite x relectron=21938.34 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 6,010,360.79 (Gamma Ray American Petroleum Institute Units)
Concentration of Uraninite per GRapi unit = 166.38 (PPB)

Uraninite 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) 5.06 ± 1.27 grams of pure Uraninite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 506.07 ±126.52 grams of pure Uraninite .

Estimated Radioactivity from Uraninite - 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 / 5.58 cm 157,788,157 4.26E-03 6,010,360.79 1,976.01
100 gm / 2.59 cm 15,778,816 4.26E-04 601,036.08 197.60
10 gm / 1.20 cm 1,577,882 4.26E-05 60,103.61 19.76
1 gm / 5.58 mm 157,788 4.26E-06 6,010.36 1.98
0.1 gm / 2.59 mm 15,779 4.26E-07 601.04 0.20
0.01 gm / 1.20 mm 1,578 4.26E-08 60.10 0.02
0.001 gm / 0.56 mm 158 4.26E-09 6.01 0.00

Weight of pure Uraninite in grams (gm) and Calculated Diameter of a Sphere with a Density of 10.97 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
 

Uraninite Classification

Help on  Dana Class: Dana Class: 05.01.01.01 (05)Oxides Containing Uranium and Thorium
  (05.01)with a cation charge of 4+ (AO2)
  (05.01.01)Dana Group
 
05.01.01.01 Uraninite UO2 F m3m 4/m 3 2/m
 
05.01.01.02 Thorianite ThO2 F m3m 4/m 3 2/m
Help on  Strunz Class: Strunz Class: 04.DL.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.D - Metal:Oxygen = 1:2 and similar
  04.DL -With large (� medium-sized) cations; fluorite-type structures
 
04.DL.05 Cerianite-(Ce) (Ce,Th)O2 F m3m 4/m 3 2/m
 
04.DL.05 Zirkelite (Ca,Th,Ce)Zr(Ti,Nb)2O7 F m3m 4/m 3 2/m
 
04.DL.05 Thorianite ThO2 F m3m 4/m 3 2/m
 
04.DL.05 Uraninite UO2 F m3m 4/m 3 2/m
 

Other Uraninite Information

Help on References: References: NAME( Mason68) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Uraninite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - Franklin Minerals(Dunn)
7 - GeoScienceWorld
8 - Glendale Community College
9 - Google Images
10 - Google Scholar
11 - Handbook of Mineralogy (MinSocAm)
12 - Handbook of Mineralogy (UofA)
13 - MinDAT
14 - Mineral and Gemstone Kingdom
15 - Mineralienatlas (Deutsch)
16 - Online Mineral Museum
17 - Philatelic Mineralogy
18 - QUT Mineral Atlas
19 - Ruff.Info
20 - Scandinavian mineral gallery
21 - University of Colorado - Mineral Structure Data
22 - Uranium Minerals
23 - WWW-MINCRYST

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

Uraninite

UO2
Dana No: 05.01.01.01 Strunz No: 04.DL.05
Locality:

 

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