... .33Crystal ClassCubic, hexagonalCrystal StructurePolycrystallineDensity, g/cm3 at 293 K5.27Melting Temperature, K1790Thermal Conductivity, W/(m K) at 300 K18Thermal Expansion, 1 ... 10-6Specific Heat, cal/(g K) at 296 K0.081Debye Temperature, K246Bandgap, eV2.7Solubility in water at 298 K0.001 g ...