"Other substances that expand on freezing are acetic acid, silicon, gallium,[35] germanium, bismuth, plutonium and also chemical compounds that form spacious cr

"Other substances that expand on freezing are acetic acid, silicon, gallium,[35] germanium, bismuth, plutonium and also chemical compounds that form spacious crystal lattices with tetrahedral coordination."[0] [0] - https://en.wikipedia.org/wiki/Properties_of_water#Density_of_water_and_ice https://en.wikipedia.org/wiki/Properties_of_water#Density_of...