*Density: 2.203 g/cm
*Hardness: 5.3–6.5 (Mohs scale), 8.8 GPa
*Tensile strength: 48.3 MPa
*Compressive strength: > 1.1 GPa
*Bulk modulus: ~37 GPa
*Rigidity modulus: 31 GPa
*Young's modulus: 71.7 GPa
*Poisson's ratio: 0.17
*Lamé elastic constants: λ = 15.87 GPa, μ = 31.26 GPa
*Coefficient of thermal expansion: 5.5 × 10/K (average 20–320 °C)
*Thermal conductivity: 1.3 W/(m·K)
*Specific heat capacity: 45.3 J/(mol·K)
*Softening point: ≈ 1665 °C
*Annealing point: ≈ 1140 °C
*Strain point: 1070 °C
*Electrical resistivity: > 10 Ω·m
*Dielectric constant: 3.75 at 20 °C 1 MHz
*Dielectric loss factor: less than 0.0004 at 20 °C 1 MHz typically 6 × 10 at 10 GHz
*Dielectric strength:  250–400 kV/cm at 20 °C
*Magnetic susceptibility: −11.28 × 10 (SI, 22 °C)
*Hamaker constant: A = 6.5 × 10 J.
*Surface tension: 0.300 N/m at 1800–2400 °C
*Index of refraction: n = 1.4585 (at 587.6 nm)
*Change of refractive index with temperature: 1.28 × 10/K (20–30 °C)
*Stress-optic coefficients: p = 0.113, p = 0.252.
*Abbe number: Vd = 67.82