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Physical Properties of Covellite
Cleavage:
{0001} Perfect
Color:
Indigo blue, Light blue, Dark blue, Black.
Density:
4.6 - 4.76, Average = 4.68
Diaphaneity:
Opaque
Fracture:
Brittle - Generally displayed by glasses and most non-metallic minerals.
Habit:
Foliated - Two dimensional platy forms.
Habit:
Platy - Sheet forms (e.g. micas).
Hardness:
1.5-2 - Talc-Gypsum
Luminescence:
Non-fluorescent.
Luster:
Metallic
Magnetism:
Nonmagnetic
Streak:
black gray
Optical Properties of Covellite
Dichroism (e):
deep blue.
Dichroism (w):
blackish blue.
Optical Data:
Uniaxial (+), w=1.45, e=2.62, bire=1.1700.
RL Anisotrophism:
Strong.
RL Color:
Indigo-blue, commonly highly iridescent, brass yellow to deep red.
RL Pleochroism:
Marked, deep blue to blue-white.
Reflectivity
Standardized Intensity (100%) Reflection Spectra of Covellite in Air
λ
R1
R2
∑ R1(λ)
∑ R2(λ)
400 nm
16.60
30.70
420 nm
15.70
29.80
440 nm
14.80
28.90
460 nm
13.70
27.80
480 nm
12.20
26.60
500 nm
10.60
25.10
520 nm
8.80
23.50
540 nm
6.80
21.90
560 nm
5.20
20.40
580 nm
3.80
19.30
600 nm
3.00
19.00
620 nm
3.20
19.50
640 nm
4.60
20.20
660 nm
8.70
20.80
680 nm
15.20
21.40
700 nm
24.20
22.30
Calculated Relative Intensity Colors of Covellite in Air
Relative Intensity
0%
100%
200%
300%
400%
500%
600%
700%
800%
900%
1000%
R1
R2
Calculated Properties of Covellite
Electron Density:
Bulk Density (Electron Density)=4.41 gm/cc note: Specific Gravity of Covellite =4.68 gm/cc.
Fermion Index:
Fermion Index = 0.0025153223 Boson Index = 0.9974846777
Photoelectric:
PECovellite = 31.55 barns/electron U=PECovellite x rElectron Density= 139.00 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Covellite is Not Radioactive
Covellite Classification
Dana Class:
02.08.12.01(02)Sulfides - Including Selenides and Tellurides
Chemical Formula: 
