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Physical Properties of Semseyite
Cleavage:
{112} Good
Color:
Black, Gray.
Density:
5.8 - 6.1, Average = 5.94
Diaphaneity:
Opaque
Fracture:
Brittle - Generally displayed by glasses and most non-metallic minerals.
Habit:
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Habit:
Spherical - Spherical, rounded aggregates.
Habit:
Tabular - Form dimensions are thin in one direction.
Hardness:
2.5 - Finger Nail
Luster:
Metallic
Streak:
black
Optical Properties of Semseyite
Optical Data:
NCalc= 1.47 - from Gladstone-Dale relationship (KC = 0.0761) where Ncalc=Dcalc*KC+1 NCalc= 1.45 - from Gladstone-Dale relationship (KC = 0.0761) where Ncalc=Dmeas*KC+1
RL Anisotrophism:
Strong.
RL Color:
White with light green tint.
RL Pleochroism:
Very weak, in yellow green to darker, grayish green.
Reflectivity
Standardized Intensity (100%) Reflection Spectra of Semseyite in Air
λ
R1
R2
∑ R1(λ)
∑ R2(λ)
400 nm
39.20
47.70
420 nm
38.30
46.60
440 nm
37.40
45.50
460 nm
36.90
44.80
480 nm
36.50
44.20
500 nm
36.30
43.80
520 nm
36.10
43.60
540 nm
36.00
43.30
560 nm
35.80
42.90
580 nm
35.30
42.30
600 nm
34.80
41.60
620 nm
34.10
40.70
640 nm
33.40
39.80
660 nm
32.50
38.70
680 nm
31.50
37.60
700 nm
30.50
36.80
Calculated Relative Intensity Colors of Semseyite in Air
Relative Intensity
0%
30%
60%
90%
100%
120%
150%
180%
210%
240%
260%
R1
R2
Calculated Properties of Semseyite
Electron Density:
Bulk Density (Electron Density)=5.22 gm/cc note: Specific Gravity of Semseyite =6.19 gm/cc.
Fermion Index:
Fermion Index = 0.11 Boson Index = 0.89
Photoelectric:
PESemseyite =1,063.61 barns/electron U=PESemseyite x rElectron Density=5,556.15 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Semseyite is Not Radioactive
Chemical Formula: 
