ˈplattnerite [Named (by Haidinger 1845) after its describer K. F. Plattner: see -ite1.] Native dioxide of lead (PbO2) occurring in violet black concretions. 1849J. Nicol Min. 418 Plattnerite..[is] hexagonal but dimensions unknown.1892Dana Min. (ed. 6) 239.