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Physical Properties of Penfieldite
Cleavage:
{0001} Distinct
Color:
Colorless, White, Yellowish, Bluish.
Density:
5.82
Diaphaneity:
Transparent
Habit:
Pyramidal - Crystals are shaped like pyramids.
Habit:
Tabular - Form dimensions are thin in one direction.
Hardness:
3-4 - Calcite-Fluorite
Luster:
Adamantine - Greasy
Streak:
white
Optical Properties of Penfieldite
Gladstone-Dale:
CI meas= -0.126 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= -0.092 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.195,KPDmeas= 0.201,KC= 0.1786 Ncalc = 2.04 - 2.07
Optical Data:
Uniaxial (+), w=2.13, e=2.21, bire=0.0800.
Calculated Properties of Penfieldite
Electron Density:
Bulk Density (Electron Density)=5.00 gm/cc note: Specific Gravity of Penfieldite =6.00 gm/cc.
Fermion Index:
Fermion Index = 0.17 Boson Index = 0.83
Photoelectric:
PEPenfieldite =1,421.47 barns/electron U=PEPenfieldite x rElectron Density=7,105.18 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Penfieldite is Not Radioactive
Chemical Formula: 
