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Physical Properties of Phlogopite
Cleavage:
{001} Perfect
Color:
Brown, Gray, Green, Yellow, Reddish brown.
Density:
2.7 - 2.9, Average = 2.8
Diaphaneity:
Transparent to translucent
Fracture:
Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Habit:
Lamellar - Thin laminae producing a lamellar structure.
Habit:
Micaceous - Platy texture with "flexible" plates.
Habit:
Scaly - Morphology like fish scales.
Hardness:
2-2.5 - Gypsum-Finger Nail
Luminescence:
Fluorescent, Short UV=Straw to Lemon Yellow, Long UV=Weak Blue-white to blue-gray.
Luster:
Vitreous - Pearly
Streak:
white
Optical Properties of Phlogopite
Gladstone-Dale:
CI meas= -0.009 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2034,KPDmeas= 0.2055,KC= 0.2037 Ncalc = 1.55 - 1.59
Optical Data:
Biaxial (-), a=1.53-1.573, b=1.557-1.617, g=1.558-1.618, bire=0.0280-0.0450, 2V(Calc)=16-20, 2V(Meas)=0-12. Dispersion weak to distinct, r < v.
Pleochroism (x):
colorless, pale yellow, orange, salmon pink, or brown. red brown.
Pleochroism (y):
brownish yellow, buff, reddish orange, pale reddish brown, or colorless.
Calculated Properties of Phlogopite
Electron Density:
Bulk Density (Electron Density)=2.81 gm/cc note: Specific Gravity of Phlogopite =2.83 gm/cc.
Fermion Index:
Fermion Index = 0.02 Boson Index = 0.98
Photoelectric:
PEPhlogopite = 2.30 barns/electron U=PEPhlogopite x relectron= 6.46 barns/cc.
Radioactivity:
GRapi = 133.53 (Gamma Ray American Petroleum Institute Units)
Concentration of Phlogopite per GRapi unit = 0.75 (%)
Estimated Radioactivity from Phlogopite - barely detectable
Phlogopite Classification
Dana Class:
71.02.02b.01(71)Phyllosilicate Sheets of Six-Membered Rings
Chemical Formula: 
- barely detectable