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Physical Properties of Tilasite
Cleavage:
{101} Good
Color:
Violet gray, Green, Gray, Pink brown.
Density:
3.77
Diaphaneity:
Translucent
Fracture:
Brittle - Generally displayed by glasses and most non-metallic minerals.
Habit:
Massive - Uniformly indistinguishable crystals forming large masses.
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Hardness:
5 - Apatite
Luminescence:
Fluorescent, Short UV=pink-orange.
Luster:
Vitreous - Resinous
Optical Properties of Tilasite
Gladstone-Dale:
CI meas= 0.013 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.021 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1732,KPDmeas= 0.1746,KC= 0.177 Ncalc = 1.67
Optical Data:
Biaxial (-), a=1.64, b=1.66, g=1.675, bire=0.0350, 2V(Calc)=80, 2V(Meas)=82.733. Dispersion r < v.
Pleochroism (x):
colorless.
Pleochroism (y):
colorless.
Pleochroism (z):
colorless.
Calculated Properties of Tilasite
Electron Density:
Bulk Density (Electron Density)=3.60 gm/cc note: Specific Gravity of Tilasite =3.77 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PETilasite = 25.48 barns/electron U=PETilasite x rElectron Density= 91.61 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Tilasite is Not Radioactive
Tilasite Classification
Dana Class:
41.05.06.01(41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
Chemical Formula: 
