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Physical Properties of Spinel
Cleavage:
None
Color:
Colorless, Red, Blue, Green, Brown.
Density:
3.57 - 3.72, Average = 3.64
Diaphaneity:
Transparent to translucent to opaque
Fracture:
Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Habit:
Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Habit:
Massive - Granular - Common texture observed in granite and other igneous rock.
Hardness:
8 - Topaz
Luminescence:
Sometimes Fluorescent, Short UV=red, Long UV=red.
Luster:
Vitreous (Glassy)
Magnetism:
Nonmagnetic
Streak:
grayish white
Optical Properties of Spinel
Gladstone-Dale:
CI meas= -0.017 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= -0.035 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2123,KPDmeas= 0.2085,KC= 0.205 Ncalc = 1.73 - 1.76
Optical Data:
Isotropic, n=1.72-1.8.
Calculated Properties of Spinel
Electron Density:
Bulk Density (Electron Density)=3.59 gm/cc note: Specific Gravity of Spinel =3.65 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PESpinel = 1.48 barns/electron U=PESpinel x rElectron Density= 5.32 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Spinel is Not Radioactive
Chemical Formula: 
