Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Habit:
Square - Occurs as square crystals in shape or outline.
Hardness:
4.5 - Between Fluorite and Apatite
Luster:
Vitreous - Adamantine
Streak:
rusty brown
Optical Properties of Wakefieldite-(Ce)
Dichroism (w):
yellow.
Gladstone-Dale:
CI meas= -0.048 (Good) - where the CI = (1-KPDmeas/KC) CI calc= 0.066 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1873,KPDmeas= 0.2101,KC= 0.2005 Ncalc = 1.95 - 2.07
Optical Data:
Uniaxial (?), b=2.
Calculated Properties of Wakefieldite-(Ce)
Electron Density:
Bulk Density (Electron Density)=4.14 gm/cc note: Specific Gravity of Wakefieldite-(Ce) =4.76 gm/cc.
Fermion Index:
Fermion Index = 0.06 Boson Index = 0.94
Photoelectric:
PEWakefieldite-(Ce) = 680.98 barns/electron U=PEWakefieldite-(Ce) x relectron=2,819.60 barns/cc.
Radioactivity:
GRapi = 27,671.42 (Gamma Ray American Petroleum Institute Units)
Concentration of Wakefieldite-(Ce) per GRapi unit = 36.14 (PPM)
Wakefieldite-(Ce) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.
Estimated Radioactivity from Wakefieldite-(Ce) - weak
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 / 7.38 cm
668,047
1.81E-05
27,671.42
9.10
100 gm / 3.42 cm
66,805
1.81E-06
2,767.14
0.91
10 gm / 1.59 cm
6,680
1.81E-07
276.71
0.09
1 gm / 7.38 mm
668
1.81E-08
27.67
0.01
0.1 gm / 3.42 mm
67
1.81E-09
2.77
0.00
0.01 gm / 1.59 mm
7
1.81E-10
0.28
0.00
0.001 gm / 0.74 mm
1
1.81E-11
0.03
0.00
Weight of pure Wakefieldite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.76 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
Estimated Thorium Activity ( 1.49 % Th) From Sum REE Elements (29.82 % REE)
Chemical Formula: 
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- weak