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Physical Properties of Cochromite
Cleavage:
{???} Indistinct
Color:
Black.
Density:
5.22
Diaphaneity:
Opaque
Fracture:
Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Habit:
Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Hardness:
7 - Quartz
Luster:
Metallic
Streak:
green
Optical Properties of Cochromite
Optical Data:
NCalc= 2.18 - from Gladstone-Dale relationship (KC = 0.2425) where Ncalc=Dcalc*KC+1 NCalc= 2.27 - from Gladstone-Dale relationship (KC = 0.2425) where Ncalc=Dmeas*KC+1
Reflectivity
Standardized Intensity (100%) Reflection Spectra of Cochromite in Air
λ
R
∑ R(λ)
480 nm
14.30
546 nm
13.70
589 nm
14.00
656 nm
13.90
Calculated Relative Intensity Colors of Cochromite in Air
Relative Intensity
0%
70%
100%
140%
210%
280%
350%
420%
490%
560%
630%
R
Calculated Properties of Cochromite
Electron Density:
Bulk Density (Electron Density)=4.61 gm/cc note: Specific Gravity of Cochromite =4.85 gm/cc.
Fermion Index:
Fermion Index = 0.03 Boson Index = 0.97
Photoelectric:
PECochromite = 17.80 barns/electron U=PECochromite x rElectron Density= 82.11 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Cochromite is Not Radioactive
Chemical Formula: 
