Ccook06 Posted August 7, 2012 Posted August 7, 2012 Hello, I am looking for some help identifying a rock found by my father in Eastern Montana. It is roughly the size of a football and weighs almost 10lbs. It resembles a geode but it has no crystals and is quite smooth throughout the center. This rock has not been cut, it is hollow all the way through. Any help is really appreciated! Thanks!
Ophiolite Posted September 25, 2012 Posted September 25, 2012 It appears to me to be botryoidal hematite that has been subject to some erosion. I imagine it was found in a river bed. See this wikipedia article.
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