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Mazzi F , Ungaretti L , Neues Jahrbuch fur Mineralogie, Monatshefte , 1994 (1994) p.49-66, The crystal structure of vitusite from Ilimaussaq (South Greenland):, Na3REE(PO4)2, Locality: Ilimaussaq, South Greenland
Physical Properties of Vitusite-(Ce)
Cleavage:
{100} Good, {010} Good, {001} Good
Color:
White, Light green, Light pink.
Density:
3.6 - 3.7, Average = 3.65
Habit:
Pseudo Hexagonal - Crystals show a hexagonal outline.
Hardness:
4.5 - Between Fluorite and Apatite
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Vitusite-(Ce)
Gladstone-Dale:
CI meas= -0.03 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= 0.006 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1678,KPDmeas= 0.1738,KC= 0.1688 Ncalc = 1.61 - 1.64
Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 7.96 cm
786,738
2.13E-05
34,715.34
11.41
100 gm / 3.70 cm
78,674
2.13E-06
3,471.53
1.14
10 gm / 1.72 cm
7,867
2.13E-07
347.15
0.11
1 gm / 7.96 mm
787
2.13E-08
34.72
0.01
0.1 gm / 3.70 mm
79
2.13E-09
3.47
0.00
0.01 gm / 1.72 mm
8
2.13E-10
0.35
0.00
0.001 gm / 0.80 mm
1
2.13E-11
0.03
0.00
Weight of pure Vitusite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.78 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 ( 1.76 % Th) From Sum REE Elements (35.12 % REE)