It is about 7 inches in diameter and sliced about 3/4 of an inch thick. The back is the shell, but this view shows the inner structure. It is some kind of nautaloid/snaily looking thing with the inner chambers filled with different materials. Right near the opening there appears to be hardened sand. The next several chambers have a more quartz-like look. Some of the chambers are filled with dark brown material and some with a raw umber colored material. It's absolutely beautiful as you can see. If anybody out there knows what this is and when it lived in Lake Erie, I'd be curious to find out.
The stone wave is slowly growing as well. Here is what it looked like two weeks ago. It is starting to gather some momentum.