Here is an idea. What if its actually copper ore, meaning a natural rock with crystals of copper minerals in it.
Good tips boys! I'll get a small drill bit and see what's inside
have you washed it more since the first photo? i am still going with the ore guess, be interested to see it clean before you start punching holes in it.
It would appear there was, in the early 1900's, a Bronze smelting operation in Meadville Pa. To me it looks like a piece of Bronze slag.
Bronze isn't smelted, it's an alloy of coper and tin..