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Physical Properties of Kyanite
Cleavage:
{100} Perfect, {010} Imperfect
Color:
Blue, White, Gray, Green, Black.
Density:
3.56 - 3.67, Average = 3.61
Diaphaneity:
Translucent to transparent
Fracture:
Brittle - Generally displayed by glasses and most non-metallic minerals.
Habit:
Columnar - Forms columns
Habit:
Fibrous - Crystals made up of fibers.
Hardness:
4-7
Luminescence:
Non-fluorescent.
Luster:
Vitreous - Pearly
Streak:
white
Optical Properties of Kyanite
Gladstone-Dale:
CI meas= 0.036 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= 0.05 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1969,KPDmeas= 0.1999,KC= 0.2074 Ncalc = 1.74 - 1.76
Optical Data:
Biaxial (-), a=1.712-1.718, b=1.72-1.725, g=1.727-1.734, bire=0.0150-0.0160, 2V(Calc)=84, 2V(Meas)=82. Dispersion weak, r > v.
Pleochroism (x):
colorless or colorless.
Pleochroism (y):
colorless or pale blue.
Calculated Properties of Kyanite
Electron Density:
Bulk Density (Electron Density)=3.57 gm/cc note: Specific Gravity of Kyanite =3.62 gm/cc.
Fermion Index:
Fermion Index = 0.0083309363 Boson Index = 0.9916690637
Photoelectric:
PEKyanite = 1.64 barns/electron U=PEKyanite x rElectron Density= 5.85 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Kyanite is Not Radioactive
Kyanite Classification
Dana Class:
52.02.02c.01(52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O
Chemical Formula: 
