The rock looks like iron pyrite, but its hard to tell from the picture. Does it chip or dent when you apply pressure to it with a knife? If it dents or bends, its metal (likely native copper or melted brass) if it breaks, its probably pyrite.
The rock looks like iron pyrite, but its hard to tell from the picture. Does it chip or dent when you apply pressure to it with a knife? If it dents or bends, its metal (likely native copper or melted brass) if it breaks, its probably pyrite.