Bismuth
Bismuth is a silver metal with a pink tinge to it. This pink color is because of its oxide coating.  Bismuth is a post-transition metal.  It is one of the strongest diamagnetic metals.  It is almost as heavy as lead.  It is quite brittle.  It can make crystals with a shiny surface.  Its melting point is quite low: , which is normal for post-transition metals.  As a liquid it is denser and has a smaller volume than as a solid.  Another chemical that does this is water.  It does not conduct electricity or heat very well.