Brittle - Generally displayed by glasses and most non-metallic minerals.
Habit:
Aggregates - Made of numerous individual crystals or clusters.
Habit:
Platy - Sheet forms (e.g. micas).
Hardness:
2-3 - Gypsum-Calcite
Luminescence:
Fluorescent, Short UV=bright lemon yellow, Long UV=yellowish green.
Luster:
Pearly
Streak:
light yellow
Optical Properties of Uranospinite
Gladstone-Dale:
CI meas= -0.056 (Good) - where the CI = (1-KPDmeas/KC) CI calc= -0.124 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1779,KPDmeas= 0.1671,KC= 0.1582 Ncalc = 1.51 - 1.55
Optical Data:
Biaxial (-), a=1.56, b=1.582, g=1.587, bire=0.0270, 2V(Calc)=50, 2V(Meas)=0-5. Dispersion r > v moderate.
Pleochroism (x):
colorless.
Pleochroism (y):
pale yellow.
Pleochroism (z):
pale yellow.
Calculated Properties of Uranospinite
Electron Density:
Bulk Density (Electron Density)=3.10 gm/cc note: Specific Gravity of Uranospinite =3.45 gm/cc.
Fermion Index:
Fermion Index = 0.0035195187 Boson Index = 0.9964804813
Photoelectric:
PEUranospinite =1,169.85 barns/electron U=PEUranospinite x relectron=3,623.41 barns/cc.
Radioactivity:
GRapi = 3,509,218.19 (Gamma Ray American Petroleum Institute Units)
Concentration of Uranospinite per GRapi unit = 284.96 (PPB)
Uranospinite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.
Estimated Radioactivity from Uranospinite - very strong
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 / 8.21 cm
82,084,893
2.22E-03
3,509,218.19
1,153.72
100 gm / 3.81 cm
8,208,489
2.22E-04
350,921.82
115.37
10 gm / 1.77 cm
820,849
2.22E-05
35,092.18
11.54
1 gm / 8.21 mm
82,085
2.22E-06
3,509.22
1.15
0.1 gm / 3.81 mm
8,208
2.22E-07
350.92
0.12
0.01 gm / 1.77 mm
821
2.22E-08
35.09
0.01
0.001 gm / 0.82 mm
82
2.22E-09
3.51
0.00
Weight of pure Uranospinite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.45 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: 
- very strong