I've done a lot of reading and based on the interior sampling and an interview with Stephen Altener at UofI, I think this is either a diabase with unusually high attraction to magnets or a higher number L chondrite(4?5?). Either way, it's a very interesting rock.

Sorry I've been away. I'll get some pics of some small pieces I managed to break off. What I do know is that it passes the ceramic tile test and does not contain quartz.

My name is Jason. I am 30 years old and from the small town of Dwight, IL. I don't consider myself a "hunter" as I only have one suspect rock which has sat around for who knows how long. When my brother stuck a magnet to it, THAT's when I became curious! When I was a little kid, I was the one weird kid with the glasses that studied the rocks on the playground during recess instead of playing. Regardless of origin, this rock has sparked a long-forgotten interest.

Here is that pic of a chunk:

I was told this is a diabase rock which matches the descriptions I've seen over and over. It's unusual for diabases to have much if any silica. Meaning it's not quartz. Scratching on ceramic and glass suggests: not quartz, not hematite, not magnetite. I trusted Prof. Altener to check. Notice the squarish "crystal".. upper-middle.. Feldspar. The whitish veins.. olivine and feldspar. The brown on the perimeter is from the surface of the rock. This piece is a crest of rock between troughs covering 360 degrees of the rock like a dimpled golfball with golfball-sized dimples. The side view in the first picture is probably the poorest example of this weathering.

There's a backstory of nearly 120 years of loony events and 4 generations too embarassing to go into.

I'm not convinced in either direction.