|What is it?
Probably some kind of volcanic rock, like a basalt.
The rock came from northern Illinois where someone picked it up after
seeing a meteor fall 50 years ago. We hear this kind of story a lot,
and so far none of the rocks have been meteorites. It's not easy
find the right rock. Also, a meteor stops "burning"
miles above the ground, so it's very difficult to determine where
it actually falls, if there is any material left to "land"
at all. Most meteors "burn up" completely in the atmosphere.