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Physical Properties of Pyrite
Cleavage:
{100} Poor, {110} Poor
Color:
Pale brass yellow.
Density:
5 - 5.02, Average = 5.01
Diaphaneity:
Opaque
Fracture:
Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Habit:
Druse - Crystal growth in a cavity which results in numerous crystal tipped surfaces.
Habit:
Stalactitic - Shaped like pendant columns as stalactites or stalagmites (e.g. calcite).
Habit:
Striated - Parallel lines on crystal surface or cleavage face.
Hardness:
6.5 - Pyrite
Luminescence:
Non-fluorescent.
Luster:
Metallic
Magnetism:
Magnetic after heating
Streak:
greenish black
Optical Properties of Pyrite
RL Color:
Creamy white.
Reflectivity
Standardized Intensity (100%) Reflection Spectra of Pyrite in Air
λ
R
∑ R(λ)
400 nm
38.20
420 nm
40.50
440 nm
42.80
460 nm
45.50
480 nm
48.50
500 nm
51.00
520 nm
53.60
540 nm
53.80
560 nm
54.60
580 nm
55.00
600 nm
55.20
620 nm
55.50
640 nm
56.00
660 nm
56.40
680 nm
56.80
700 nm
57.00
Calculated Relative Intensity Colors of Pyrite in Air
Relative Intensity
0%
30%
60%
90%
100%
120%
150%
180%
200%
R
Calculated Properties of Pyrite
Electron Density:
Bulk Density (Electron Density)=4.84 gm/cc note: Specific Gravity of Pyrite =5.01 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PEPyrite = 16.89 barns/electron U=PEPyrite x rElectron Density= 81.83 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Pyrite is Not Radioactive
Pyrite Classification
Dana Class:
02.12.01.01(02)Sulfides - Including Selenides and Tellurides
Chemical Formula: 
