Mystery metal

 

We found this piece of metal whilst on a beach clean at Crosscanonby. It looks superficially like aluminium but is heavy so I decided to try to identify it by density. Mass shown above. Dimensions are 12.6 cm x 1.9 cm x 0.45 cm which gives a density of 8.6 g/cm^3. That could be cadmium but cadmium is soft and this isn't. Best guess is that it is some kind of alloy.