Calcite is a negative uniaxial crystal that has h..
High temperature form BBO ( -BaB2O4) are negative ..
Yttrium Vanadate (YVO4) crystals have good mechani..
Optically, crystalline quartz is used extensively ..
MgF2 single crystal is a birefrigent material with..
LiNbO3 Crystal is widely used as frequency doubler..