Dark Green, Yellowish Green, Blueish Green, Light Green, Light Brown
appearance, refractive index and high birefringence; then optic figure, pleochroism and specific gravity
Misnomer: Emeraldite. Not all verdelite is elbaite tourmaline Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH). Pyroelectric: development of opposite charges at the ends of a tourmaline crystal due to change in temperature. Piezoelectric: development of opposite charges at the ends of a tourmaline crystal when placed under stress.