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Physical Properties of Monazite-(La)
Cleavage:
{001} Distinct, {100} Indistinct
Color:
Brown, Brown, Yellowish brown, Pink, Yellow.
Density:
4.8 - 5.5, Average = 5.15
Diaphaneity:
Transparent to Subtranslucent
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-(La)
Gladstone-Dale:
CI meas= 0.009 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.042 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1508,KPDmeas= 0.1561,KC= 0.1574 Ncalc = 1.76 - 1.87
Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 7.18 cm
2,166,567
5.86E-05
91,600.36
30.12
100 gm / 3.33 cm
216,657
5.86E-06
9,160.04
3.01
10 gm / 1.55 cm
21,666
5.86E-07
916.00
0.30
1 gm / 7.18 mm
2,167
5.86E-08
91.60
0.03
0.1 gm / 3.33 mm
217
5.86E-09
9.16
0.00
0.01 gm / 1.55 mm
22
5.86E-10
0.92
0.00
0.001 gm / 0.72 mm
2
5.86E-11
0.09
0.00
Weight of pure Monazite-(La) 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: 
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