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Physical Properties of Millerite
Cleavage:
{1011} Perfect, {0112} Perfect
Color:
Bronze, Greenish gray, Gray, Brass yellow.
Density:
5.5
Diaphaneity:
Opaque
Fracture:
Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Habit:
Acicular - Occurs as needle-like crystals.
Habit:
Massive - Uniformly indistinguishable crystals forming large masses.
Hardness:
3-3.5 - Calcite-Copper Penny
Luminescence:
Non-fluorescent.
Luster:
Metallic
Magnetism:
Magnetic after heating
Streak:
greenish black
Optical Properties of Millerite
RL Anisotrophism:
Strong.
RL Pleochroism:
Weak in air, stronger in oil, pale yellow-brown to bright yellow.
Reflectivity
Standardized Intensity (100%) Reflection Spectra of Millerite in Air
λ
R1
R2
∑ R1(λ)
∑ R2(λ)
400 nm
26.70
29.80
420 nm
32.00
35.00
440 nm
37.30
40.20
460 nm
42.00
44.30
480 nm
46.60
47.40
500 nm
50.00
49.50
520 nm
52.80
51.60
540 nm
54.80
52.90
560 nm
56.10
54.00
580 nm
57.20
54.80
600 nm
58.00
55.60
620 nm
58.80
56.20
640 nm
59.50
56.80
660 nm
60.10
57.20
680 nm
60.60
57.60
700 nm
61.00
57.90
Calculated Relative Intensity Colors of Millerite in Air
Relative Intensity
0%
30%
60%
90%
100%
120%
150%
180%
210%
230%
R1
R2
Calculated Properties of Millerite
Electron Density:
Bulk Density (Electron Density)=5.21 gm/cc note: Specific Gravity of Millerite =5.37 gm/cc.
Fermion Index:
Fermion Index = 0.0099573802 Boson Index = 0.9900426198
Photoelectric:
PEMillerite = 27.75 barns/electron U=PEMillerite x rElectron Density= 144.51 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Millerite is Not Radioactive
Millerite Classification
Dana Class:
02.08.16.01(02)Sulfides - Including Selenides and Tellurides
Chemical Formula: 
