Optical Properties
Luster
Not Available
Not Available
Pleochroism
AbsentWalter Schumann
O = brownish red; E = yellowish red
Dispersion
None
Not Available
Transparency
Transparent, Translucent
OpaqueHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references
Refractive Index
1.370-1.470
2.690-3.220
Optic Character
Not Available
Not Available
Crystal System
Not Available
Trigonal
Birefringence
Not Available
0.280
Clarity
Transparent
OpaqueHerve Nicolas Lazzarelli
