However, the selected area's electron diffraction shows that it has both cubic and hexagonal phase structures corresponding to different shapes. This is attributed to the isomeric state of ZnS.

The Raman spectra of both of isomeric crystal and its melt show the vibration mode of the same isolated anionic coordination polyhedron.

Also, the rate and manner of freezing has been shown to have an affect on the physical form (polymorph) of the drug substance.