biggfredd - you reminded me of a fishing trip I took to Michigan's Upper Peninsula, copper country. We were trout fishing in small streams running through paper company land. The streams were lined with chunks of copper ore. Here's one I brought home that weighs about 8 lbs. It also has quartz and iron pyrite in it.


Oops, I should have put something next to it for perspective. It's about 10" from end to end.
I use it for a door stop.