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Physical Properties of Pyatenkoite-(Y)
Cleavage:
{0112} Indistinct
Color:
Colorless.
Density:
2.68
Diaphaneity:
Transparent to Translucent
Fracture:
Brittle - Generally displayed by glasses and most non-metallic minerals.
Habit:
Rhombohedral Crystals - Occurs as well-formed crystals showing rhobohedral crystals.
Hardness:
4-5 - Fluorite-Apatite
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Pyatenkoite-(Y)
Gladstone-Dale:
CI meas= 0.018 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2317,KPDmeas= 0.2274,KC= 0.2317 Ncalc = 1.61 - 1.62
Optical Data:
Uniaxial (-), e=1.607, w=1.612, bire=0.0050.
Calculated Properties of Pyatenkoite-(Y)
Electron Density:
Bulk Density (Electron Density)=2.59 gm/cc note: Specific Gravity of Pyatenkoite-(Y) =2.63 gm/cc.
Fermion Index:
Fermion Index = 0.03 Boson Index = 0.97
Photoelectric:
PEPyatenkoite-(Y) = 38.02 barns/electron U=PEPyatenkoite-(Y) x relectron= 98.65 barns/cc.
Radioactivity:
GRapi = 4,095.36 (Gamma Ray American Petroleum Institute Units)
Concentration of Pyatenkoite-(Y) per GRapi unit = 244.18 (PPM)
Pyatenkoite-(Y) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.
Estimated Radioactivity from Pyatenkoite-(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 / 8.99 cm
87,173
2.36E-06
4,095.36
1.35
100 gm / 4.17 cm
8,717
2.36E-07
409.54
0.13
10 gm / 1.94 cm
872
2.36E-08
40.95
0.01
1 gm / 8.99 mm
87
2.36E-09
4.10
0.00
0.1 gm / 4.17 mm
9
2.36E-10
0.41
0.00
0.01 gm / 1.94 mm
1
2.36E-11
0.04
0.00
0.001 gm / 0.90 mm
0
2.36E-12
0.00
0.00
Weight of pure Pyatenkoite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 2.63 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 ( 0.19 % Th) From Sum REE Elements ( 3.89 % REE)
Chemical Formula: 
- mild