Brittle - Uneven - Very brittle fracture producing uneven fragments.
Habit:
Irregular Grains - Occurs as splotchy, anhedral crystals forming inclusions in other minerals or rocks.
Hardness:
5 - Apatite
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Moskvinite-(Y)
Gladstone-Dale:
CI meas= 0.005 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.008 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1917,KPDmeas= 0.1923,KC= 0.1932 Ncalc = 1.56
Optical Data:
Biaxial (+), a=1.555, b=1.558, g=1.566, bire=0.0110, 2V(Calc)=64, 2V(Meas)=64. Dispersion r > v moderate.
Calculated Properties of Moskvinite-(Y)
Electron Density:
Bulk Density (Electron Density)=2.82 gm/cc note: Specific Gravity of Moskvinite-(Y) =2.91 gm/cc.
Fermion Index:
Fermion Index = 0.03 Boson Index = 0.97
Photoelectric:
PEMoskvinite-(Y) = 60.78 barns/electron U=PEMoskvinite-(Y) x relectron= 171.31 barns/cc.
Radioactivity:
GRapi = 6,494.10 (Gamma Ray American Petroleum Institute Units)
Concentration of Moskvinite-(Y) per GRapi unit = 153.99 (PPM)
Moskvinite-(Y) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.
Estimated Radioactivity from Moskvinite-(Y) - mild
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 / 8.69 cm
140,806
3.81E-06
6,494.10
2.14
100 gm / 4.03 cm
14,081
3.81E-07
649.41
0.21
10 gm / 1.87 cm
1,408
3.81E-08
64.94
0.02
1 gm / 8.69 mm
141
3.81E-09
6.49
0.00
0.1 gm / 4.03 mm
14
3.81E-10
0.65
0.00
0.01 gm / 1.87 mm
1
3.81E-11
0.06
0.00
0.001 gm / 0.87 mm
0
3.81E-12
0.01
0.00
Weight of pure Moskvinite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 2.91 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 ( 0.31 % Th) From Sum REE Elements ( 6.17 % REE)
Chemical Formula: 
- mild