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Physical Properties of Molybdenite
Cleavage:
{0001} Perfect
Color:
Black, Lead gray, Gray.
Density:
5.5
Diaphaneity:
Opaque
Fracture:
Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).
Habit:
Disseminated - Occurs in small, distinct particles dispersed in matrix.
Habit:
Foliated - Two dimensional platy forms.
Habit:
Massive - Uniformly indistinguishable crystals forming large masses.
Hardness:
1 - Talc
Luminescence:
Non-fluorescent.
Luster:
Metallic
Magnetism:
Nonmagnetic
Streak:
greenish gray
Optical Properties of Molybdenite
RL Anisotrophism:
Very strong.
RL Color:
Gray, very pale yellow to deep reddish brown in transmitted light.
RL Pleochroism:
Very strong.
Reflectivity
Standardized Intensity (100%) Reflection Spectra of Molybdenite in Air
λ
R1
R2
∑ R1(λ)
∑ R2(λ)
400 nm
21.00
55.00
420 nm
22.20
54.80
440 nm
23.40
54.60
460 nm
24.10
53.80
480 nm
23.80
52.30
500 nm
22.70
49.70
520 nm
21.90
47.10
540 nm
21.30
45.50
560 nm
20.90
44.40
580 nm
20.60
44.00
600 nm
20.40
44.60
620 nm
20.20
45.30
640 nm
20.00
45.70
660 nm
20.00
45.60
680 nm
19.90
45.40
700 nm
19.70
44.20
Calculated Relative Intensity Colors of Molybdenite in Air
Relative Intensity
0%
50%
100%
150%
200%
250%
300%
350%
400%
430%
R1
R2
Calculated Properties of Molybdenite
Electron Density:
Bulk Density (Electron Density)=4.62 gm/cc note: Specific Gravity of Molybdenite =5.00 gm/cc.
Fermion Index:
Fermion Index = 0.15 Boson Index = 0.85
Photoelectric:
PEMolybdenite = 101.34 barns/electron U=PEMolybdenite x rElectron Density= 468.49 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Molybdenite is Not Radioactive
Molybdenite Classification
Dana Class:
02.12.10.01(02)Sulfides - Including Selenides and Tellurides
Chemical Formula: 
