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Regular - Flat surfaces (not cleavage) fractured in a regular pattern.
Habit:
Fibrous - Crystals made up of fibers.
Habit:
Massive - Uniformly indistinguishable crystals forming large masses.
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Hardness:
7 - Quartz
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
grayish white
Optical Properties of Epidote
Gladstone-Dale:
CI meas= 0.118 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= 0.175 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2042,KPDmeas= 0.2184,KC= 0.2477 Ncalc = 1.82 - 1.91
Optical Data:
Biaxial (-), a=1.723-1.751, b=1.73-1.784, g=1.736-1.797, bire=0.0130-0.0460, 2V(Calc)=62-84, 2V(Meas)=64-89. Dispersion strong, r > v.
Pleochroism (x):
colorless, pale green, or pale yellow.
Pleochroism (y):
greenish yellow, greenish brown, or greenish yellow.
Calculated Properties of Epidote
Electron Density:
Bulk Density (Electron Density)=3.39 gm/cc note: Specific Gravity of Epidote =3.45 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PEEpidote = 9.83 barns/electron U=PEEpidote x rElectron Density= 33.35 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Epidote is Not Radioactive
Epidote Classification
Dana Class:
58.02.01a.02(58)Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups
(58.02)with cations in [6] and higher coordination; single and double groups (n=1,2)
Chemical Formula: 
