Optical Properties
Luster
Vitreous, Pearly
Vitreous, Pearly
Pleochroism
Anomalous plechroism is strong with colours deep blue/pale yellowish green/yellowish green.Michael OâDonoghue
AbsentWalter Schumann
Dispersion
Not Available
0.01
26
Transparency
Transparent
Translucent
Refractive Index
1.560-1.640
1.620-1.850
Optic Character
Not Available
Not Available
Crystal System
Not Available
Trigonal
Birefringence
0.054-0.075
0.223-0.227
Clarity
Transparent
Translucent
