This is a fairly large and heavy native copper specimen. Measures in at 4 in tall top to bottom 3 and 1/2 in wide at its widest point in 2 in thick at the thickest point. This specimen formed branching globular and well formed copper crystals.a really great display piece.This specimen has had all but some of the rock matrix removed that it was encased in. It weighs in at 375 grams.this specimen comes out of the keweenaw peninsula. Unsure of the specific mine though. All in all a fantastic specimen!