My first couple of tries, it was a little difficult to get the consistancy of the mud right. Just a hint, you really don't want it all that wet. More of a shortbread dough consistancy. I found that worked the best. I was really supprised by how it came out. It's kinda like a smaller, rough pool (billiard) ball. Very hard. Be careful not to drop it though. It landed on a pillow but hit a spiral bound notebook binding and it chipped off some of the dirt. So, they -are- kind of fragile. I think you'll really enjoy making these.
Oh, the dirt came from Primm, Nevada, right outside of Las Vegas. We stopped there to get gas on our way home from our first trip there with a couple friends.