Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Hardness:
4 - Fluorite
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Abenakiite-(Ce)
Dichroism (e):
None.
Dichroism (w):
None.
Gladstone-Dale:
CI meas= -0.051 (Good) - where the CI = (1-KPDmeas/KC) CI calc= -0.016 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.177,KPDmeas= 0.183,KC= 0.1741 Ncalc = 1.56 - 1.58
Optical Data:
Uniaxial (-), e=1.586, w=1.589, bire=0.0030.
Calculated Properties of Abenakiite-(Ce)
Electron Density:
Bulk Density (Electron Density)=3.13 gm/cc note: Specific Gravity of Abenakiite-(Ce) =3.32 gm/cc.
Fermion Index:
Fermion Index = 0.05 Boson Index = 0.95
Photoelectric:
PEAbenakiite-(Ce) = 178.05 barns/electron U=PEAbenakiite-(Ce) x relectron= 557.99 barns/cc.
Radioactivity:
GRapi = 29,815.33 (Gamma Ray American Petroleum Institute Units)
Concentration of Abenakiite-(Ce) per GRapi unit = 33.54 (PPM)
Abenakiite-(Ce) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.
Estimated Radioactivity from Abenakiite-(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 / 8.32 cm
663,314
1.79E-05
29,815.33
9.80
100 gm / 3.86 cm
66,331
1.79E-06
2,981.53
0.98
10 gm / 1.79 cm
6,633
1.79E-07
298.15
0.10
1 gm / 8.32 mm
663
1.79E-08
29.82
0.01
0.1 gm / 3.86 mm
66
1.79E-09
2.98
0.00
0.01 gm / 1.79 mm
7
1.79E-10
0.30
0.00
0.001 gm / 0.83 mm
1
1.79E-11
0.03
0.00
Weight of pure Abenakiite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.32 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 ( 1.48 % Th) From Sum REE Elements (29.51 % REE)
Chemical Formula: 
- weak