Simply put, this is a gigantic copper crystal. When they reach this size, they are usually a hell of a lot cruder and you have to somewhat imagine where the outline is-- not the case with this one. While the surface is on the rough side, you can clearly see the faces, and the typical rill-ice surface features. There are also a number of smaller crystals perched near the bottom.
It's a very satisfyingly heavy, chunky rock.... when it arrived it stayed on my bedside table for a couple days so I could fiddle around with it. Usually they just go straight to the basement. Is that a relevant selling point? No... but if it made me happy it might make you happy too.
Exact locality provided to buyer.