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Physical Properties of Tetradymite
Cleavage:
{0001} Perfect
Color:
Steel gray, Yellow gray.
Density:
7.2 - 7.9, Average = 7.55
Diaphaneity:
Opaque
Fracture:
Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Habit:
Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Habit:
Lamellar - Thin laminae producing a lamellar structure.
Habit:
Pseudo Hexagonal - Crystals show a hexagonal outline.
Hardness:
1.5-2 - Talc-Gypsum
Luminescence:
Non-fluorescent.
Luster:
Metallic
Magnetism:
Nonmagnetic
Streak:
steel gray
Optical Properties of Tetradymite
RL Anisotrophism:
Weak.
RL Color:
White.
Reflectivity
Standardized Intensity (100%) Reflection Spectra of Tetradymite in Air
λ
R1
R2
∑ R1(λ)
∑ R2(λ)
400 nm
50.00
52.70
420 nm
50.80
53.60
440 nm
51.60
54.50
460 nm
52.00
55.00
480 nm
52.40
55.40
500 nm
52.70
55.80
520 nm
53.00
56.20
540 nm
53.20
56.40
560 nm
53.30
56.50
580 nm
53.40
56.60
600 nm
53.50
56.70
620 nm
53.50
56.80
640 nm
53.40
56.90
660 nm
53.40
57.00
680 nm
53.40
57.10
700 nm
53.50
57.20
Calculated Relative Intensity Colors of Tetradymite in Air
Relative Intensity
0%
20%
40%
60%
80%
100%
120%
140%
160%
170%
R1
R2
Calculated Properties of Tetradymite
Electron Density:
Bulk Density (Electron Density)=6.19 gm/cc note: Specific Gravity of Tetradymite =7.63 gm/cc.
Fermion Index:
Fermion Index = 0.02 Boson Index = 0.98
Photoelectric:
PETetradymite =1,313.02 barns/electron U=PETetradymite x rElectron Density=8,125.77 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Tetradymite is Not Radioactive
Tetradymite Classification
Dana Class:
02.11.07.01(02)Sulfides - Including Selenides and Tellurides
Chemical Formula: 
