Vermiculite prospects at the head of Big Sandy Creek, Rocky Boy�s Indian Reservation, about 40 km east of Box Elder, Hill Co., Montana, USA. Link to MinDat.org Location Data.
Name Origin:
Named for Wilbur Sweet Burbank (1898-1975), geologist of the U.S. Geological Survey.
CI meas= -0.039 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= 0.036 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1647,KPDmeas= 0.1774,KC= 0.1708 Ncalc = 1.6 - 1.64
Optical Data:
Uniaxial (?), a=1.615, b=1.627, bire=0.0120.
Calculated Properties of Burbankite
Electron Density:
Bulk Density (Electron Density)=3.49 gm/cc note: Specific Gravity of Burbankite =3.77 gm/cc.
Fermion Index:
Fermion Index = 0.04 Boson Index = 0.96
Photoelectric:
PEBurbankite = 131.97 barns/electron U=PEBurbankite x relectron= 460.00 barns/cc.
Radioactivity:
GRapi = 5,871.73 (Gamma Ray American Petroleum Institute Units)
Concentration of Burbankite per GRapi unit = 170.31 (PPM)
Burbankite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.
Estimated Radioactivity from Burbankite - 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 / 7.97 cm
133,361
3.60E-06
5,871.73
1.93
100 gm / 3.70 cm
13,336
3.60E-07
587.17
0.19
10 gm / 1.72 cm
1,334
3.60E-08
58.72
0.02
1 gm / 7.97 mm
133
3.60E-09
5.87
0.00
0.1 gm / 3.70 mm
13
3.60E-10
0.59
0.00
0.01 gm / 1.72 mm
1
3.60E-11
0.06
0.00
0.001 gm / 0.80 mm
0
3.60E-12
0.01
0.00
Weight of pure Burbankite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.77 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 ( 5.95 % REE)
Chemical Formula: 
- mild