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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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  • $\begingroup$ 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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