Brittle - Generally displayed by glasses and most non-metallic minerals.
Hardness:
2.5 - Finger Nail
Luster:
Vitreous - Adamantine
Streak:
light green
Optical Properties of Metatorbernite
Gladstone-Dale:
CI meas= -0.097 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= -0.111 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1689,KPDmeas= 0.1667,KC= 0.152 Ncalc = 1.56 - 1.58
Optical Data:
Uniaxial (+), w=1.624, e=1.626, bire=0.0020.
Calculated Properties of Metatorbernite
Electron Density:
Bulk Density (Electron Density)=3.35 gm/cc note: Specific Gravity of Metatorbernite =3.75 gm/cc.
Fermion Index:
Fermion Index = 0.0038218599 Boson Index = 0.9961781401
Photoelectric:
PEMetatorbernite =1,292.44 barns/electron U=PEMetatorbernite x relectron=4,331.50 barns/cc.
Radioactivity:
GRapi = 3,867,593.03 (Gamma Ray American Petroleum Institute Units)
Concentration of Metatorbernite per GRapi unit = 258.56 (PPB)
Metatorbernite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.
Estimated Radioactivity from Metatorbernite - 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 / 7.99 cm
90,879,176
2.46E-03
3,867,593.03
1,271.54
100 gm / 3.71 cm
9,087,918
2.46E-04
386,759.30
127.15
10 gm / 1.72 cm
908,792
2.46E-05
38,675.93
12.72
1 gm / 7.99 mm
90,879
2.46E-06
3,867.59
1.27
0.1 gm / 3.71 mm
9,088
2.46E-07
386.76
0.13
0.01 gm / 1.72 mm
909
2.46E-08
38.68
0.01
0.001 gm / 0.80 mm
91
2.46E-09
3.87
0.00
Weight of pure Metatorbernite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.75 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