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Blocky - Crystal shape tends to be equant (e.g. feldspars).
Habit:
Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Hardness:
6 - Orthoclase
Luminescence:
Sometimes fluorescent.- red-purple
Luster:
Vitreous (Glassy)
Streak:
white green
Optical Properties of Diopside
Gladstone-Dale:
CI meas= 0.015 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= -0.027 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2126,KPDmeas= 0.2039,KC= 0.207 Ncalc = 1.67 - 1.73
Optical Data:
Biaxial (+), a=1.663-1.699, b=1.671-1.705, g=1.693-1.728, bire=0.0290-0.0300, 2V(Calc)=56-64, 2V(Meas)=58-63. Dispersion weak to distinct, r > v.
Pleochroism (x):
pale bluish green or dark blue green.
Pleochroism (y):
brownish green or dark blue green.
Calculated Properties of Diopside
Electron Density:
Bulk Density (Electron Density)=3.39 gm/cc note: Specific Gravity of Diopside =3.40 gm/cc.
Fermion Index:
Fermion Index = 0.02 Boson Index = 0.98
Photoelectric:
PEDiopside = 3.51 barns/electron U=PEDiopside x rElectron Density= 11.91 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Diopside is Not Radioactive
Chemical Formula: 
