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.
Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above
Galy J , Meunier G , Acta Crystallographica, Section B , 27 (1971) p.608-616, A propos de la cliffordite UTe3O8. Le Systeme UO3-TeO2 a 700 C. Structure, cristalline de UTe3O9, Locality: synthetic, Sample: T = 700 C
Physical Properties of Cliffordite
Color:
Yellow, Sulfur yellow.
Density:
6.57
Hardness:
4 - Fluorite
Luster:
Adamantine
Streak:
light yellow
Optical Properties of Cliffordite
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
Electron Density:
Bulk Density (Electron Density)=5.78 gm/cc note: Specific Gravity of Cliffordite =6.91 gm/cc.
Fermion Index:
Fermion Index = 0.04 Boson Index = 0.96
Photoelectric:
PECliffordite =1,027.30 barns/electron U=PECliffordite x relectron=5,940.13 barns/cc.
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 Radioactivity from Cliffordite - very strong
Specimen Size Weight/Volume (Sphere) *
Calculated Activity Becquerels (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