Peak broadening in C2/c Ca-rich homogeneous pyroxenes was interpreted to be a consequence of
the positional disorder of the Ca and Mg in the M2 cavity: peak broadening increases with increasing
Mg content for peaks assigned to M2-O vibrations, but it changes little for peaks assigned to chain
bending, which suggests that cation substitution in the M2 cavity occurs with little interaction with the
silicate chain. Furthermore peak broadening was observed in intermediate pyroxenes as a consequence
of mottled textures, antiphase domains, and compositional inhomogeneity.