The Arrhenius relationship for Nd diffusion in oligoclase, for diffusion normal to (010) was:

D(m2/s) =2.3 x 10-3 exp[-425(kJ/mol)//RT]

Diffusion normal to (001) appears to be slightly faster than diffusion normal to (010).

D.J.Cherniak: Chemical Geology, 2002, 193[1-2], 25-41