# Elastic constants of hcp zirconium
# E. S. Fisher and C. J. Renken, Phys. Rev. 135, A482 (1964).
elastic Voigt
155.4 155.4 172.5  #C11 C22 C33
 64.6  64.6  68.2  #C23 C31 C12
 36.3  36.3  44.1  #C44 C55 C66