Strange aggregate - seems too light to be metallic

[partenr]

Found this in my girl's front yard. It really sounds off on the machine. It is very lightweight..... ??

 

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[Rasputin]

Melted aluminum can.

 

[fisher2]

looks like melted metal called slag to me proll alum but we can never tell

 

[Woodland Detectors]

Pot metal/slag