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Some kind of mineral?
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Lots here to read.
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=0CCYQFjAB&url=http%3A%2F%2Fwww.indiana.edu%2F~geol105%2F1425 chap5.h
Toward the bottom of page on the link is a material called schist, that looks similar.
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From indiana it is unlikely it is schist. There are no metamorphics in In and if it were glacial it is unlikely schist would survive. It is hard to tell without checking the mineralogy but it could be some sort of mafic gneiss or volcanic tuff. Either would explain the banding. The rounded nature of the rock would suggest it is glacial outwash.
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