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I found this rock while walking in Western Kentucky. Can't seem to ID it. It doesn't chip. Tried cutting it and smashing and only managed to scratch it.

It was partially buried when I found it. It is very heavy for its size. I will post weight and dimensions a little later.

Also, is it worth breaking open? If so does anyone have an idea of how to accomplish that considering its extreme hardness.

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closed as off-topic by user12525, Peter Jansson, trond hansen, arkaia, uhoh Sep 4 at 1:37

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Questions about rock identification requests are off-topic. For more information, see the announcement on meta." – Community, Peter Jansson, trond hansen, arkaia, uhoh
If this question can be reworded to fit the rules in the help center, please edit the question.

  • $\begingroup$ Please read this and add the required additional information $\endgroup$ – Jan Doggen Jun 20 '17 at 18:33
  • $\begingroup$ Break it with a hammer. Rocks are strong, but surrender to hammers given a well meant blow. $\endgroup$ – Gimelist Jun 25 '17 at 10:25
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You have what is commonly known as iron or iron oxide concretion. These concretions or nodules are composed in part of the iron oxy-hydroxides, limonite and goethite come in a wide variety of unusual shapes. They form commonly around a piece of organic material (like wood or plant material) or around a fossil shell.

Iron oxide nodules can be quite dense and are sometimes mistaken for a meteorite. (Reference).

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