7 For EMSE 428 (40 pts) A single crystal of calcite, CaCO₃, is trigonal with point group 3m. The measured values of the thermal expansion of calcite at 25°C are: α₁₁ = -5.6x10⁻⁶ (K1) and α₃₃- 25x10⁻⁶(K⁻¹)

Using Neumann's Law deduce the thermal expansion matrix for this point group