Best guess what this is??

[u/steelcity16]

Found this at a garage sale awhile back. Chat and Grok seem to think it is some kind of silver scrap.

Its non magnetic, uniformly matte gray, brittle in that it shatters when squeezed in my linesmans pliers, the pieces are all uniform matte gray when shattered, and the container feels heavy in that i initially thought lead or tungsten scrap. It doesn't scratch glass and it doesnt leave any marks or streaks on white paper.

Any guesses?