What is this

Rodger d

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Joined
Jun 20, 2017
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I found this in northern ND. It's a smooth black rock that has 3 layers, first layer is smooth black and brittle, second layer is a very soft, almost powder rust red substance, inner layer seems to be metallic. Magnet test was negative.
 

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Could be any one of a variety of iron ore...Only one variety is magnetic...Magnetite
 
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