Pseudo Rhombohedral - Crystals show a rhombohedral outline.
Hardness:
5.5 - Knife Blade
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Kemmlitzite
Gladstone-Dale:
CI meas= 0.026 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= 0.018 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1956,KPDmeas= 0.1939,KC= 0.1991 Ncalc = 1.72
Optical Data:
Uniaxial (+), w=1.701, e=1.707, bire=0.0060.
Calculated Properties of Kemmlitzite
Electron Density:
Bulk Density (Electron Density)=3.46 gm/cc note: Specific Gravity of Kemmlitzite =3.60 gm/cc.
Fermion Index:
Fermion Index = 0.0063590884 Boson Index = 0.9936409116
Photoelectric:
PEKemmlitzite = 70.48 barns/electron U=PEKemmlitzite x relectron= 243.97 barns/cc.
Radioactivity:
GRapi = 11,117.58 (Gamma Ray American Petroleum Institute Units)
Concentration of Kemmlitzite per GRapi unit = 89.95 (PPM)
Kemmlitzite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.
Estimated Radioactivity from Kemmlitzite - weak
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 / 8.10 cm
242,798
6.56E-06
11,117.58
3.66
100 gm / 3.76 cm
24,280
6.56E-07
1,111.76
0.37
10 gm / 1.74 cm
2,428
6.56E-08
111.18
0.04
1 gm / 8.10 mm
243
6.56E-09
11.12
0.00
0.1 gm / 3.76 mm
24
6.56E-10
1.11
0.00
0.01 gm / 1.74 mm
2
6.56E-11
0.11
0.00
0.001 gm / 0.81 mm
0
6.56E-12
0.01
0.00
Weight of pure Kemmlitzite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.60 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 ( 0.54 % Th) From Sum REE Elements (10.84 % REE)
Chemical Formula: 
- weak