Mineralogy Database

Thorianite Mineral Data

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General Thorianite Information

Help on Chemical  Formula: Chemical Formula: ThO2
Help on Composition: Composition: Molecular Weight = 264.04 gm
   Thorium  87.88 %  Th  100.00 % ThO2
   Oxygen   12.12 %  O
           ______        ______ 
           100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: ThO2
Help on Environment: Environment: Pegmatites and alluvial deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1904
Help on Locality: Locality: Balangoda, Sabaragamuwa prov., Sri Lanka Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for its chemical composition containing thorium.
Help on Name Pronunciation: Name Pronunciation: Thorianite + Pronunciation Say THORIANITE
Help on Synonym: Synonym: ICSD 67413
  PDF 42-1462
 

Thorianite Image

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  Thorianite

Comments: Thorianite penetration twin.
Location: Huddersfield, Quebec, Canada. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Thorianite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 5.595, Z = 4; V = 175.15 Den(Calc)= 10.01
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): 3.234(1), 1.689(0.64), 1.98(0.58),
Help on Forms: Forms:

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Help on Above

Forms: ( 1 0 0) ( 0 1 0)

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Physical Properties of Thorianite

Help on Cleavage: Cleavage: {100} Imperfect, {010} Imperfect, {001} Imperfect
Help on Color: Color: Brownish black, Green, Green black, Gray green, Yellow.
Help on Density: Density: 10
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Habit: Habit: Pseudo Hexagonal - Crystals show a hexagonal outline.
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luminescence: Luminescence: Radioactive.
Help on Luster: Luster: Metallic
Help on Streak: Streak: greenish gray
 

Optical Properties of Thorianite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.237 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.237 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1274,KPDmeas= 0.1275,KC= 0.167
Ncalc = 2.67
Help on Optical Data: Optical Data: Isotropic, n=2.2-2.35.
Help on RL Color: RL Color: Gray with red-brown internal reflections.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Thorianite in Air
λ R  ∑ R(λ) 
 400 nm   16.60   
 420 nm   16.60 
 440 nm   16.60 
 460 nm   16.50 
 480 nm   16.30 
 500 nm   16.00 
 520 nm   15.70 
 540 nm   15.40 
 560 nm   15.20 
 580 nm   15.10 
 600 nm   15.00 
 620 nm   14.90 
 640 nm   14.80 
 660 nm   14.70 
 680 nm   14.60 
 700 nm   14.50 
Calculated Relative Intensity Colors of Thorianite in Air
Relative
Intensity
   0%   60% 100% 120% 180% 240% 300% 360% 420% 480% 540% 590%
R                        
 

Calculated Properties of Thorianite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=8.04 gm/cc
note: Specific Gravity of Thorianite =10.0 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0000590503
Boson Index = 0.9999409497
Help on Photoelectric: Photoelectric: PEThorianite =2,302.30 barns/electron
U=PEThorianite x relectron=18504.09 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 1,505,305.42 (Gamma Ray American Petroleum Institute Units)
Concentration of Thorianite per GRapi unit = 664.32 (PPB)

Thorianite 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) 20.21 ± 5.05 grams of pure Thorianite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 2020.6 ±505.16 grams of pure Thorianite .

Estimated Radioactivity from Thorianite - 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 / 5.76 cm 39,370,659 1.06E-03 1,505,305.42 494.89
100 gm / 2.67 cm 3,937,066 1.06E-04 150,530.54 49.49
10 gm / 1.24 cm 393,707 1.06E-05 15,053.05 4.95
1 gm / 5.76 mm 39,371 1.06E-06 1,505.31 0.49
0.1 gm / 2.67 mm 3,937 1.06E-07 150.53 0.05
0.01 gm / 1.24 mm 394 1.06E-08 15.05 0.00
0.001 gm / 0.58 mm 39 1.06E-09 1.51 0.00

Weight of pure Thorianite in grams (gm) and Calculated Diameter of a Sphere with a Density of 10.01 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
 

Thorianite Classification

Help on  Dana Class: Dana Class: 05.01.01.02 (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 Thorianite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Thorianite :
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 - University of Colorado - Mineral Structure Data
16 - Uranium Minerals
17 - WWW-MINCRYST

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

Thorianite

ThO2
Dana No: 05.01.01.02 Strunz No: 04.DL.05
Locality:

 

Notes:

 

 
   
 


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