This paper describes the formation of chalcogenide glasses with high contents of heavy metals and some of their properties. In the systems HgSe‐GeSe‐GeSe2, HgTe‐GeSe‐GeSe2and HgTe‐GeTe‐GeSe2glasses up to 25 mole % Hg can be prepared on conventional cooling technique from the melt. HgSe‐GeSe melts yield also glasses are formed up to 22 mole % Pb. Ge‐Sn‐Se‐Te glasses were investigated in series substituting the homologous elements by each other. Conclusions on the structure are drawn from measurements of the density, thermal, optical and electric properties.