Synthetically-made wulfenite will have the following composition: 61.38% PbO and 38.6% MoO3. This synthesis will give you samples of wulfenite that is pale-yellow in thin sections and is optically negative. It crystallizes in the tetragonal system, in the form of square tabular crystals, and with distinct cleavage on {011}. It crystals also display transparency and adamantine luster. The X-ray diffraction data, calculated cell dimensions, constants and optic axial angles of the synthetic wulfenite are consistent with those of the natural mineral.