Forms solid solution with chalcopyrite. 27.5 See stannite. 23.3 to 24.3 See stannite. 13.8 to 18.3 Compares optically with umangite. Also see tenorite under monoclinic.
Optical properties vary with composition.
Makedonite PbTiO 3 C 4v 1 ferroelectric Shirane et al.