Abstract

Makedonite, natural PbTiO ₃, occurs included in hematite and magnetoplumbite at Långban, Sweden. Electron microprobe analysis yielded PbO 74.5(5) wt. %, FeO 1.0(5), TiO ₂ 24.5(5), = 100.1(5)%. The mineral is tetragonal with a= 3.91±0.01, c=4.16±0.01 Å. Micro-indentation hardness (load 100 g)=606-681 kg/mm ²; reflectance 22.5% (470 nm), 21.0 (546 nm), 20.8 (589 nm), 20.2 (650 nm).