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Physical Properties of Pentagonite
Cleavage:
{010} Good
Color:
Greenish blue.
Density:
2.33
Diaphaneity:
Transparent
Fracture:
Brittle - Generally displayed by glasses and most non-metallic minerals.
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Habit:
Rosette - Bundled tabular aggregates resembling rose flower petals.
Habit:
Twinning Common - Crystals are usually twinned.
Hardness:
3-4 - Calcite-Fluorite
Luster:
Vitreous (Glassy)
Streak:
bluish white
Optical Properties of Pentagonite
Gladstone-Dale:
CI meas= 0.102 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= 0.106 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2321,KPDmeas= 0.2331,KC= 0.2596 Ncalc = 1.6 - 1.61
Optical Data:
Biaxial (-), a=1.533-1.54, b=1.544-1.545, g=1.547-1.55, bire=0.0100-0.0140, 2V(Calc)=54-88, 2V(Meas)=50. Dispersion r < v extreme.
Pleochroism (x):
colorless.
Pleochroism (y):
blue.
Pleochroism (z):
colorless.
Calculated Properties of Pentagonite
Electron Density:
Bulk Density (Electron Density)=2.34 gm/cc note: Specific Gravity of Pentagonite =2.33 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PEPentagonite = 4.15 barns/electron U=PEPentagonite x rElectron Density= 9.71 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Pentagonite is Not Radioactive
Chemical Formula: 
