All of the minerals are different, like pyrite, chalcopyrite even though they look the same.  But they are definitely different, chalcopyrite is made of copper, pyrite is made of iron sulfide.  

Tomorrow is an inset day so mummy and I are going to Lyme Regis where Mary Anning went fossil hunting.  We are going to see how many fossils we can find.  

Yesterday we went swimming, I swam half a length on my front and half a length on my back.