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Physical Properties of Fillowite
Cleavage:
{001} Perfect
Color:
Yellow, Reddish brown, Colorless.
Density:
3.43
Diaphaneity:
Transparent to translucent
Fracture:
Brittle - Uneven - Very brittle fracture producing uneven fragments.
Habit:
Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Habit:
Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Hardness:
4.5 - Between Fluorite and Apatite
Luminescence:
Non-fluorescent.
Luster:
Resinous - Greasy
Streak:
white
Optical Properties of Fillowite
Gladstone-Dale:
CI meas= -0.03 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= 0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1899,KPDmeas= 0.196,KC= 0.1903 Ncalc = 1.65 - 1.67
Optical Data:
Uniaxial (+), w=1.671, e=1.676, bire=0.0010.
Calculated Properties of Fillowite
Electron Density:
Bulk Density (Electron Density)=3.40 gm/cc note: Specific Gravity of Fillowite =3.54 gm/cc.
Fermion Index:
Fermion Index = 0.0025006297 Boson Index = 0.9974993703
Photoelectric:
PEFillowite = 11.43 barns/electron U=PEFillowite x rElectron Density= 38.89 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Fillowite is Not Radioactive
Chemical Formula: 
