Relation between the structure of wulfenite, PbMoO 4, as an example of scheelite type structure, and the morphology of its crystals

A new approach for seeking PBC's applicable to every known structure has been applied to the wulfenite structure. The following PBC's have been analyzed: straight - [110], [021] and [001], and zigzag chains - [100], [111], [131], [331], [011], and their symmetrical equivalents. It is established through a comparison with the zone development of the crystals with scheelite type structure that all chains determined and no others, effect the morphology. The chains are also distinguished according to the distances between the neighbouring metal Pb and Mo bound with oxygen. Chains within which this distance is shortest, i.e. 3.84 Å only determine a single F-form {001}, the F-forms {011}, {112}, {013} and {010} are added for chains which have a distance of 4.10 Å. If all chains derived are taken into account, {121} and {110} become F-forms, too. The morphological variations of the crystals with scheelite type structure are also analyzed using the PBC method.