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Physical Properties of Franklinite
Cleavage:
None
Color:
Black, Brownish black.
Density:
5.07 - 5.22, Average = 5.14
Diaphaneity:
Opaque
Fracture:
Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Habit:
Crystalline - Fine - Occurs as well-formed fine sized crystals.
Habit:
Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Habit:
Massive - Uniformly indistinguishable crystals forming large masses.
Hardness:
5.5-6 - Knife Blade-Orthoclase
Luminescence:
Non-fluorescent.
Luster:
Sub Metallic
Magnetism:
Naturally weak
Streak:
reddish brown
Optical Properties of Franklinite
Gladstone-Dale:
CI meas= 0.005 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.027 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2586,KPDmeas= 0.2643,KC= 0.2658 Ncalc = 2.35 - 2.4
Optical Data:
Isotropic, n=2.36.
RL Color:
White to gray, with dark red internal reflections.
Reflectivity
Standardized Intensity (100%) Reflection Spectra of Franklinite in Air
λ
R
∑ R(λ)
400 nm
19.20
420 nm
19.20
440 nm
19.20
460 nm
19.20
480 nm
19.20
500 nm
19.10
520 nm
19.00
540 nm
18.60
560 nm
18.20
580 nm
17.80
600 nm
17.40
620 nm
17.10
640 nm
16.80
660 nm
16.60
680 nm
16.40
700 nm
16.30
Calculated Relative Intensity Colors of Franklinite in Air
Relative Intensity
0%
60%
100%
120%
180%
240%
300%
360%
420%
480%
510%
R
Calculated Properties of Franklinite
Electron Density:
Bulk Density (Electron Density)=4.85 gm/cc note: Specific Gravity of Franklinite =5.15 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PEFranklinite = 24.90 barns/electron U=PEFranklinite x rElectron Density= 120.91 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Franklinite is Not Radioactive
Chemical Formula: 
