Intermediate phase between theαandβphases of quartz

It is argued that the "microtwins model" for the intermediate phase of quartz, which has been proposed on the basis of electron microscope observations [for example, Phys. Rev. B 31, 2986 (1985], does not fit our x-ray observations, particularly the satellite reflections which depend on $\mathbf{g}$ (reflection) and $\mathbf{q}$ (modulation) vectors. The behavior in more than 20 Laue spots is well explained by the $3\mathbf{q}$ model of "the configuration waves" which are primarily transverse.