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Brittle - Generally displayed by glasses and most non-metallic minerals.
Habit:
Acicular - Occurs as needle-like crystals.
Habit:
Nodular - Tuberose forms having irregular protuberances over the surface.
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Hardness:
5.5-6 - Knife Blade-Orthoclase
Luminescence:
Fluorescent, Short UV=ellow-orange pale green, Long UV=ellow-orange greenish white.
Luster:
Vitreous - Silky
Streak:
white
Optical Properties of Natrolite
Gladstone-Dale:
CI meas= 0.006 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.015 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2141,KPDmeas= 0.216,KC= 0.2173 Ncalc = 1.49
Optical Data:
Biaxial (+), a=1.473-1.489, b=1.476-1.491, g=1.485-1.502, bire=0.0120-0.0130, 2V(Calc)=48-62, 2V(Meas)=60-63. Dispersion weak, r < v.
Pleochroism (x):
colorless.
Pleochroism (y):
colorless.
Calculated Properties of Natrolite
Electron Density:
Bulk Density (Electron Density)=2.25 gm/cc note: Specific Gravity of Natrolite =2.25 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PENatrolite = 1.48 barns/electron U=PENatrolite x rElectron Density= 3.32 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Natrolite is Not Radioactive
Chemical Formula: 
