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Physical Properties of Tennantite
Cleavage:
None
Color:
Steel gray, Black.
Density:
4.6 - 4.7, Average = 4.65
Diaphaneity:
Opaque
Fracture:
Hackly - Jagged, torn surfaces, (e.g. fractured metals).
Habit:
Disseminated - Occurs in small, distinct particles dispersed in matrix.
Habit:
Massive - Granular - Common texture observed in granite and other igneous rock.
Habit:
Massive - Uniformly indistinguishable crystals forming large masses.
Hardness:
3.5-4 - Copper Penny-Fluorite
Luminescence:
Non-fluorescent.
Luster:
Metallic
Magnetism:
Nonmagnetic
Streak:
reddish gray
Optical Properties of Tennantite
Optical Data:
Isotropic, n=2.72.
RL Color:
Gray, inclining to black to brown to cherry-red.
RL Pleochroism:
None.
Reflectivity
Standardized Intensity (100%) Reflection Spectra of Tennantite in Air
λ
R
∑ R(λ)
400 nm
31.40
420 nm
30.60
440 nm
29.80
460 nm
29.20
480 nm
29.00
500 nm
29.00
520 nm
28.80
540 nm
28.50
560 nm
28.00
580 nm
27.30
600 nm
26.40
620 nm
25.60
640 nm
24.80
660 nm
24.20
680 nm
23.80
700 nm
23.40
Calculated Relative Intensity Colors of Tennantite in Air
Relative Intensity
0%
40%
80%
100%
120%
160%
200%
240%
280%
320%
340%
R
Calculated Properties of Tennantite
Electron Density:
Bulk Density (Electron Density)=4.30 gm/cc note: Specific Gravity of Tennantite =4.62 gm/cc.
Fermion Index:
Fermion Index = 0.0029294543 Boson Index = 0.9970705457
Photoelectric:
PETennantite = 38.34 barns/electron U=PETennantite x rElectron Density= 164.92 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Tennantite is Not Radioactive
Chemical Formula: 
