Template:Pectolite

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Pectolite
Chemical composition NaCa2Si3O8(OH)
Crystal system Triclinic
Habit Aggregate
Cleavage perfect
Fracture uneven
Hardness 5
Optic nature Biaxial +
Refractive index 1.59 - 1.63
Birefringence 0.028-0.038
Dispersion Very weak
Specific gravity 2.62 - 2.87
Lustre Silky
Fluorescence Green (SW & LW-UV)