Khibina alkaline massif, Kola peninsula, Russia; Vuorijarvi alkaline massif, Kola peninsula, Russia; Mont Saint-Hilare alkaline complex, Rouville County, Quebec, Canada. Link to MinDat.org Location Data.
Name Origin:
Named for Prof. Alexander A. Kukharenko (1914-1993), Department of Mineralogy, St. Petersburg University, St. Petersburg, Russia.
Brittle - Uneven - Very brittle fracture producing uneven fragments.
Habit:
Dendritic - Branching "tree-like" growths of great complexity (e.g. pyrolusite).
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Habit:
Stellate - Occurs as spherical, radial aggregates radiating from a "star" like point.
Hardness:
4.5 - Between Fluorite and Apatite
Luster:
Vitreous - Greasy
Streak:
white
Optical Properties of Kukharenkoite-(Ce)
Gladstone-Dale:
CI meas= 0.028 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= 0.029 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.145,KPDmeas= 0.1452,KC= 0.1493 Ncalc = 1.69 - 1.7
Optical Data:
Biaxial (-), a=1.584-1.594, b=1.71-1.724, g=1.715-1.728, bire=0.1310-0.1340, 2V(Calc)=18-20, 2V(Meas)=16. Dispersion r > v moderate.
Calculated Properties of Kukharenkoite-(Ce)
Electron Density:
Bulk Density (Electron Density)=4.08 gm/cc note: Specific Gravity of Kukharenkoite-(Ce) =4.66 gm/cc.
Fermion Index:
Fermion Index = 0.08 Boson Index = 0.92
Photoelectric:
PEKukharenkoite-(Ce) = 324.96 barns/electron U=PEKukharenkoite-(Ce) x relectron=1,325.88 barns/cc.
Radioactivity:
GRapi = 21,342.66 (Gamma Ray American Petroleum Institute Units)
Concentration of Kukharenkoite-(Ce) per GRapi unit = 46.85 (PPM)
Kukharenkoite-(Ce) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.
Estimated Radioactivity from Kukharenkoite-(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 / 7.43 cm
511,339
1.38E-05
21,342.66
7.02
100 gm / 3.45 cm
51,134
1.38E-06
2,134.27
0.70
10 gm / 1.60 cm
5,113
1.38E-07
213.43
0.07
1 gm / 7.43 mm
511
1.38E-08
21.34
0.01
0.1 gm / 3.45 mm
51
1.38E-09
2.13
0.00
0.01 gm / 1.60 mm
5
1.38E-10
0.21
0.00
0.001 gm / 0.74 mm
1
1.38E-11
0.02
0.00
Weight of pure Kukharenkoite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.66 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 ( 1.14 % Th) From Sum REE Elements (22.83 % REE)
Chemical Formula: 
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- weak