Brittle - Generally displayed by glasses and most non-metallic minerals.
Habit:
Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Habit:
Inclusions - Generally found as inclusions in other minerals.
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Stornesite-(Y)
Gladstone-Dale:
CI calc= -0.029 (Excellent) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.1948,KC= 0.1893 Ncalc = 1.61
Optical Data:
Uniaxial (+), w=1.6215, e=1.625, bire=0.0035.
Calculated Properties of Stornesite-(Y)
Electron Density:
Bulk Density (Electron Density)=3.13 gm/cc note: Specific Gravity of Stornesite-(Y) =3.20 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PEStornesite-(Y) = 9.00 barns/electron U=PEStornesite-(Y) x relectron= 28.22 barns/cc.
Radioactivity:
GRapi = 1,325.13 (Gamma Ray American Petroleum Institute Units)
Concentration of Stornesite-(Y) per GRapi unit = 754.64 (PPM)
Estimated Radioactivity from Stornesite-(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 / 8.42 cm
28,408
7.68E-07
1,325.13
0.44
100 gm / 3.91 cm
2,841
7.68E-08
132.51
0.04
10 gm / 1.81 cm
284
7.68E-09
13.25
0.00
1 gm / 8.42 mm
28
7.68E-10
1.33
0.00
0.1 gm / 3.91 mm
3
7.68E-11
0.13
0.00
0.01 gm / 1.81 mm
0
7.68E-12
0.01
0.00
0.001 gm / 0.84 mm
0
7.68E-13
0.00
0.00
Weight of pure Stornesite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.20 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 ( 0.01 % Th) From Sum REE Elements ( 0.20 % REE)
Chemical Formula: Small.jpg)
- mild