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( 1 1 0) ( 1 0 1) ( 0 0 1) ( 0 1 0)
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Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Habit:
Blocky - Crystal shape tends to be equant (e.g. feldspars).
Habit:
Massive - Granular - Common texture observed in granite and other igneous rock.
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Hardness:
6 - Orthoclase
Luminescence:
Non-fluorescent.
Luster:
Vitreous - Pearly
Streak:
white
Optical Properties of Sanidine
Gladstone-Dale:
CI meas= -0.013 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= -0.009 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2076,KPDmeas= 0.2085,KC= 0.2058 Ncalc = 1.52
Optical Data:
Biaxial (-), a=1.518-1.525, b=1.523-1.53, g=1.525-1.531, bire=0.0060-0.0070, 2V(Calc)=48-64, 2V(Meas)=60-0. Dispersion r < v distinct.
Pleochroism (x):
colorless.
Pleochroism (y):
colorless.
Calculated Properties of Sanidine
Electron Density:
Bulk Density (Electron Density)=2.51 gm/cc note: Specific Gravity of Sanidine =2.53 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PESanidine = 2.57 barns/electron U=PESanidine x relectron= 6.44 barns/cc.
Radioactivity:
GRapi = 152.94 (Gamma Ray American Petroleum Institute Units)
Concentration of Sanidine per GRapi unit = 0.65 (%)
Estimated Radioactivity from Sanidine - barely detectable
Chemical Formula: 
- barely detectable