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Physical Properties of Elpidite
Cleavage:
{???} Perfect, {???} Perfect
Color:
Brown, Colorless, Yellow brown, White, Light red.
Density:
2.54
Diaphaneity:
Transparent to translucent
Fracture:
Brittle - Generally displayed by glasses and most non-metallic minerals.
Habit:
Fibrous - Crystals made up of fibers.
Hardness:
7 - Quartz
Luminescence:
Fluorescent, Short UV=yellow-green, Long UV=yellow-green.
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Elpidite
Gladstone-Dale:
CI meas= -0.131 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= -0.06 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2317,KPDmeas= 0.2472,KC= 0.2187 Ncalc = 1.56 - 1.59
Optical Data:
Biaxial (+), a=1.56, b=1.65, g=1.674, bire=0.1140
Pleochroism (x):
colorless.
Pleochroism (y):
colorless.
Pleochroism (z):
colorless.
Calculated Properties of Elpidite
Electron Density:
Bulk Density (Electron Density)=2.67 gm/cc note: Specific Gravity of Elpidite =2.71 gm/cc.
Fermion Index:
Fermion Index = 0.03 Boson Index = 0.97
Photoelectric:
PEElpidite = 21.04 barns/electron U=PEElpidite x rElectron Density= 56.29 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Elpidite is Not Radioactive
Elpidite Classification
Dana Class:
72.05.04.02(72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
Chemical Formula: 
