Crumbly lead?

[Eleven Cents]

I found a heavy metallic lump that didn't look like ordinary slag. It crumbled when crushed in a vise, and it tests positive for lead. Is this a natural form of lead? Or maybe some kind of lead-bearing clay or putty that a plumber would have used?

 

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[Eleven Cents]

Before crushing. It's about 2 inches long.

 

[trdking]

Heat it up and see if lead runs from it? Lead can oxidize to the point of crumbling but will still melt when heated.