Help with ID please

[bigjohnnyblue]

I found this in a shallow creek while panning for gold last summer. The stream bed is dolomite. Really heavy, weighs 34 grams. Maybe nickel?

No attraction to a rare earth magnet.

 

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[BurntBear]

I have quite a few ore-associated specimens like this. I find it closely located to shale host rock types, especially the Dolomite shale. I believe it's a manganese/iron ore.