silver? aluminum? stumped!

[hick.man]

was up metal detecting a creek in northern washington way up in the mountains and found these in about 2 miles of creek. i thought they might be silver but they are real light so i thought aluminum? anyone have any ideas?

 

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[Back-of-the-boat]

Fire nuggets.Melted beer cans washed into creek from a higher up campsite.

 

[jwarner51]

Spit on it and wrap it in tinfoil, after 10ish seconds open it up and if it smells like sulfur then it's silver.

 

[trapperart]

What back of the boat said

 

[hick.man]

would be cool if it was silver, but im sure leaning towards aluminum.

 

[cruiserkev]

I find these all the time in Washington. Melted aluminum can parts. Sound like great targets in the ground but are just junk leftover from lazy campers. HH!