| Crystal Class | Trigonal |
| point Group | 3m |
| Space Group | R3c |
| Lattice Parameter (nm) | a=0.5154. c=1.3781 |
| Melting Point | 1650ºC ƒ |
| Density | 7.46 g/cm3 |
| Curie Temp | 630ºC |
| Hardness | 5.5 Mohs |
| Transparency Range | 400--5000 nm |
| Refractive Index | no=2.176,ne=2.180 |
| electro-optic Coefficient | r= 30.4 ×10-12m/V |
| Gradient of Refractive index | 5X105/cm |
| Specifications of CORETECH'S LT : | |
| Dimension tolerance | +/-0.05mm |
| Wedge Angle tolerance | +/-0.1° |
| Optical axis orientation | . +/-0.3° |
| Flatness | Lambda/4@633 nm |
| Surface Quality | 20-10 |
Optical Lens Design