Chemical Formula            Ti3+: Al2O4 Crystal Structure               Hexagonal System                                                 (Rhombohedral) Unit Cell                             a = 4.758 Å, c = 12.991 Å Density                              3.98 g cm-1 Hardness                          9 (mhos), 1525 - 2000 (Knoop) Melting Point                    2040 °C
	Thermal Conductivity       0.105 cal cm-1 s-1 (°C)-1 Thermal Expansion          8.40 x 106 (°C)-1 Specific Heat                   0.185 cal g-1 Heat Capacity                 18.6 cal (°C)-1 mole-1                                                 all at 25 (°C)
	Laser Action                    4 - Level Vibronic Absorption Band            400 nm - 600 nm                                             (peak at 490 nm) Tunable Range               660 nm - 1200 nm                                             (peak at 800 nm) Fluorescence Lifetime   3.2 ms Peak Cross-section       3 - 4 x 10-19 cm-2 Refractive Index              1.76 (nominal)