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Physical Properties of Selenium
Cleavage:
{0112} Good
Color:
Gray, Purple gray, Reddish.
Density:
4.81
Diaphaneity:
Opaque
Fracture:
Flexible - Flexible fragments.
Habit:
Crystalline - Coarse - Occurs as well-formed coarse sized crystals.
Habit:
Disseminated - Occurs in small, distinct particles dispersed in matrix.
Habit:
Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Hardness:
2 - Gypsum
Luster:
Sub Metallic
Streak:
red
Optical Properties of Selenium
Dichroism (e):
cream white.
Dichroism (w):
brown.
Optical Data:
Uniaxial (+), w=3, e=4.04, bire=1.0400.
RL Anisotrophism:
Very strong.
RL Color:
White in air, darker white to grayish brown in oil, red in transmitted light.
Reflectivity
Standardized Intensity (100%) Reflection Spectra of Selenium in Air
λ
R1
R2
∑ R1(λ)
∑ R2(λ)
400 nm
28.40
38.40
420 nm
27.40
37.80
440 nm
26.40
37.20
460 nm
25.50
36.30
480 nm
24.80
35.40
500 nm
24.30
34.70
520 nm
24.00
34.40
540 nm
24.10
34.10
560 nm
24.40
34.00
580 nm
24.80
33.90
600 nm
25.40
33.80
620 nm
25.80
33.50
640 nm
26.00
33.30
660 nm
25.80
32.90
680 nm
25.20
32.40
700 nm
24.60
31.90
Calculated Relative Intensity Colors of Selenium in Air
Relative Intensity
0%
40%
80%
100%
120%
160%
200%
240%
280%
320%
360%
R1
R2
Calculated Properties of Selenium
Electron Density:
Bulk Density (Electron Density)=4.14 gm/cc note: Specific Gravity of Selenium =4.81 gm/cc.
Fermion Index:
Fermion Index = 0.07 Boson Index = 0.93
Photoelectric:
PESelenium = 81.52 barns/electron U=PESelenium x rElectron Density= 337.68 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Selenium is Not Radioactive
Chemical Formula: 
