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Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Habit:
Tabular - Form dimensions are thin in one direction.
Hardness:
2.5-3 - Finger Nail-Calcite
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Glauberite
Gladstone-Dale:
CI meas= -0.014 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= -0.012 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1888,KPDmeas= 0.1891,KC= 0.1865 Ncalc = 1.5 - 1.53
Optical Data:
Biaxial (-), a=1.507-1.515, b=1.527-1.535, g=1.529-1.536, bire=0.0210-0.0220, 2V(Calc)=24-34, 2V(Meas)=0-7. Dispersion strong, r > v.
Pleochroism (x):
colorless.
Pleochroism (y):
colorless.
Calculated Properties of Glauberite
Electron Density:
Bulk Density (Electron Density)=2.76 gm/cc note: Specific Gravity of Glauberite =2.78 gm/cc.
Fermion Index:
Fermion Index = 0.0021443772 Boson Index = 0.9978556228
Photoelectric:
PEGlauberite = 3.43 barns/electron U=PEGlauberite x rElectron Density= 9.47 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Glauberite is Not Radioactive
Chemical Formula: 
