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Physical Properties of Enargite
Cleavage:
{110} Perfect, {100} Distinct, {010} Distinct
Color:
Steel gray, Blackish gray, Violet black.
Density:
4.4 - 4.5, Average = 4.45
Diaphaneity:
Opaque
Fracture:
Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Habit:
Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Habit:
Massive - Granular - Common texture observed in granite and other igneous rock.
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Hardness:
3 - Calcite
Luminescence:
Non-fluorescent.
Luster:
Metallic
Magnetism:
Nonmagnetic
Streak:
black
Optical Properties of Enargite
RL Anisotrophism:
Very strong, dark violet-red or olive green tones.
RL Color:
Gray to light pinkish brown with deep red internal reflections.
RL Pleochroism:
Weak.
Reflectivity
Standardized Intensity (100%) Reflection Spectra of Enargite in Air
λ
R1
R2
∑ R1(λ)
∑ R2(λ)
400 nm
27.50
30.00
420 nm
27.00
29.30
440 nm
26.50
28.60
460 nm
26.00
28.00
480 nm
25.60
27.40
500 nm
25.30
27.00
520 nm
25.10
26.60
540 nm
25.00
26.40
560 nm
25.10
26.40
580 nm
25.30
26.60
600 nm
25.70
27.00
620 nm
26.20
27.60
640 nm
26.80
28.30
660 nm
27.60
28.90
680 nm
28.20
29.60
700 nm
28.80
30.30
Calculated Relative Intensity Colors of Enargite in Air
Relative Intensity
0%
40%
80%
100%
120%
160%
200%
240%
280%
320%
350%
R1
R2
Calculated Properties of Enargite
Electron Density:
Bulk Density (Electron Density)=4.18 gm/cc note: Specific Gravity of Enargite =4.47 gm/cc.
Fermion Index:
Fermion Index = 0.0024426672 Boson Index = 0.9975573328
Photoelectric:
PEEnargite = 36.75 barns/electron U=PEEnargite x rElectron Density= 153.51 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Enargite is Not Radioactive
Chemical Formula: 
