# Can I obtain a different density of a recycled elemental material?

I am recycling Aluminum products/scrap. I melted it and then form cylindrical ingots. When I measure their density, I calculated $\pu{2.4 g/cm^3}$ but Al has density of $2.7$. I think all the materials are aluminum since they all melt in the same temperature using a home setup. Can I claim that the ingot is Al?

Similar in appearance to aluminium (density $\pu{2.7 g/cm^3}$, melting point $\pu{660 ^\circ{}C}$, source) is magnesium (density $\pu{1.7 g/cm^3}$, melting point $\pu{650 ^\circ{}C}$, source). Both are used, pure as well as in mixture of other metals (alloys), widely. Even to the point that they are mixed to form alloys with each other, for example in the frames of laptops