Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Hardness:
4 - Fluorite
Luminescence:
Fluorescent, Short UV=weak yellow green, Long UV=weak yellow green.
Luster:
Vitreous - Pearly
Streak:
white
Optical Properties of Mineevite-(Y)
Gladstone-Dale:
CI meas= 0.03 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= 0.02 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1855,KPDmeas= 0.1835,KC= 0.1893 Ncalc = 1.53 - 1.54
Optical Data:
Uniaxial (-), e=1.51, w=1.536, bire=0.0260.
Calculated Properties of Mineevite-(Y)
Electron Density:
Bulk Density (Electron Density)=2.70 gm/cc note: Specific Gravity of Mineevite-(Y) =2.82 gm/cc.
Fermion Index:
Fermion Index = 0.05 Boson Index = 0.95
Photoelectric:
PEMineevite-(Y) = 75.80 barns/electron U=PEMineevite-(Y) x relectron= 205.01 barns/cc.
Radioactivity:
GRapi = 6,134.70 (Gamma Ray American Petroleum Institute Units)
Concentration of Mineevite-(Y) per GRapi unit = 163.01 (PPM)
Mineevite-(Y) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.
Estimated Radioactivity from Mineevite-(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 / 8.78 cm
134,325
3.63E-06
6,134.70
2.02
100 gm / 4.08 cm
13,433
3.63E-07
613.47
0.20
10 gm / 1.89 cm
1,343
3.63E-08
61.35
0.02
1 gm / 8.78 mm
134
3.63E-09
6.13
0.00
0.1 gm / 4.08 mm
13
3.63E-10
0.61
0.00
0.01 gm / 1.89 mm
1
3.63E-11
0.06
0.00
0.001 gm / 0.88 mm
0
3.63E-12
0.01
0.00
Weight of pure Mineevite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 2.82 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 ( 0.30 % Th) From Sum REE Elements ( 6.00 % REE)
Chemical Formula: 
- mild