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Physical Properties of Monazite-(Nd)
Cleavage:
{001} Distinct, {100} Indistinct
Color:
Brown, Red, Yellow, Orange.
Density:
4.8 - 5.5, Average = 5.15
Diaphaneity:
Translucent
Fracture:
Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Habit:
Crystalline - Fine - Occurs as well-formed fine sized crystals.
Habit:
Twinning Common - Crystals are usually twinned.
Hardness:
5-5.5 - Apatite-Knife Blade
Luster:
Adamantine - Resinous
Streak:
grayish white
Optical Properties of Monazite-(Nd)
Gladstone-Dale:
CI meas= -0.006 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.032 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1502,KPDmeas= 0.1561,KC= 0.1552 Ncalc = 1.74 - 1.85
Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 7.18 cm
2,159,206
5.84E-05
91,491.56
30.08
100 gm / 3.33 cm
215,921
5.84E-06
9,149.16
3.01
10 gm / 1.55 cm
21,592
5.84E-07
914.92
0.30
1 gm / 7.18 mm
2,159
5.84E-08
91.49
0.03
0.1 gm / 3.33 mm
216
5.84E-09
9.15
0.00
0.01 gm / 1.55 mm
22
5.84E-10
0.91
0.00
0.001 gm / 0.72 mm
2
5.84E-11
0.09
0.00
Weight of pure Monazite-(Nd) in grams (gm) and Calculated Diameter of a Sphere with a Density of 5.15 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
Chemical Formula: 
- weak