PLEASE HELP ME UNKNOWN ROCK...

[Alwayslooking2]

Please help me I have no clue. It's silver and it has black square shape crystals in it that's the bumps you see.

 

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[Sergei 3]

Please help me I have no clue. It's silver and it has black square shape crystals in it that's the bumps you see.

Perhaps it is a kind of corundum.