text: *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