Mineralogy Database

Cliffordite Mineral Data

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General Cliffordite Information

Help on Chemical  Formula: Chemical Formula: UTe3O9
Help on Composition: Composition: Molecular Weight = 764.82 gm
   Uranium    31.12 %  U    35.31 % UO2
   Tellurium  50.05 %  Te   62.60 % TeO2
   Oxygen     18.83 %  O
             ______        ______ 
             100.00 %       97.91 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: UTe3O9
Help on IMA Status: IMA Status: Approved IMA 1969
Help on Locality: Locality: Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Clifford Frondel (1907-2002), one of the founders of Mineralogical Society of America and one of the authors of Dana's Mineralogy, 7th edition.
Help on Synonym: Synonym: ICSD 100878
  PDF 25-999
 

Cliffordite Image

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  Cliffordite

Comments: Small greenish crystals of cliffordite encrusting matrix.
Location: Candelaria Mine, Moctezuma, Sonora, Mexico. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Cliffordite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 11.371, Z = 8; V = 1,470.27 Den(Calc)= 6.91
Help on Crystal System: Crystal System: Isometric - Diploidal H-M Symbol (2/m 3) Space Group: P a3
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.282(1), 2.843(0.31), 4.02(0.28),
 

Physical Properties of Cliffordite

Help on Color: Color: Yellow, Sulfur yellow.
Help on Density: Density: 6.57
Help on Hardness: Hardness: 4 - Fluorite
Help on Luster: Luster: Adamantine
Help on Streak: Streak: light yellow
 

Optical Properties of Cliffordite

Help on Optical Data: Optical Data: NCalc= 2.11 - from Gladstone-Dale relationship (KC = 0.1611) where Ncalc=Dcalc*KC+1
NCalc= 2.06 - from Gladstone-Dale relationship (KC = 0.1611) where Ncalc=Dmeas*KC+1
 

Calculated Properties of Cliffordite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.78 gm/cc
note: Specific Gravity of Cliffordite =6.91 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PECliffordite =1,027.30 barns/electron
U=PECliffordite x relectron=5,940.13 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 2,219,836.31 (Gamma Ray American Petroleum Institute Units)
Concentration of Cliffordite per GRapi unit = 450.48 (PPB)

Cliffordite 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) 13.70 ± 3.43 grams of pure Cliffordite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 1370.2 ±342.56 grams of pure Cliffordite .

Estimated Radioactivity from Cliffordite - 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 / 6.51 cm 55,708,504 1.51E-03 2,219,836.31 729.81
100 gm / 3.02 cm 5,570,850 1.51E-04 221,983.63 72.98
10 gm / 1.40 cm 557,085 1.51E-05 22,198.36 7.30
1 gm / 6.51 mm 55,709 1.51E-06 2,219.84 0.73
0.1 gm / 3.02 mm 5,571 1.51E-07 221.98 0.07
0.01 gm / 1.40 mm 557 1.51E-08 22.20 0.01
0.001 gm / 0.65 mm 56 1.51E-09 2.22 0.00

Weight of pure Cliffordite in grams (gm) and Calculated Diameter of a Sphere with a Density of 6.91 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
 

Cliffordite Classification

Help on  Dana Class: Dana Class: 34.03.01.01 (34)Selenites - Tellurites - Sulfites
  (34.03)Dana Type
  (34.03.01)Dana Group
 
34.03.01.01 Cliffordite UTe3O9 P a3 2/m 3
Help on  Strunz Class: Strunz Class: 04.JK.75 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.J - Arsenites, Antimonites, Bismuthites, Sulfites,
  04.JK -Tellurites without additional anions, without H2O
 
04.JK.75 Cliffordite UTe3O9 P a3 2/m 3
 

Other Cliffordite Information

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

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

Cliffordite

UTe3O9
Dana No: 34.03.01.01 Strunz No: 04.JK.75
Locality:

 

Notes:

 

 
   
 


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