It is dimorphous with the orthorhombic form massicot. It also stars Julian Miester and Phyliss Massicot. It is associated with cerussite, galena, litharge, massicot, mimetite, native lead, and wulfenite. Massicot is lead (II) oxide mineral with an orthorhombic lattice structure. Lead-tin yellow was sometimes called massicot, although it is a different substance.