Any Geoligests here

When I was a kid and in 4H, I found a rock similar looking.
I asked our conservation leader what it was. He told me it was leaverite. I said really. He said yup leaverite there.:)

On a more serious note. If you have a college with a geology department they may be able to tell you what it is, or you maybe able to go to a the county agriculture extension office.