This specimen is a very robust and aesthetic cluster of RAZOR-sharp copper crystals to 1.5 cm, arranged in branchlike aggregations that twist and turn about to make this a 3-dimensional "tree-like" shape overall. The crystals are sharp, and there is remarkably no damage or rubbing to the fine, old surface patina. It is complete all around, and displays dramatically in person. Formerly in the Marc Weill collection, this is a very fine cabinet sized copper of unusual appeal for this habit and style of crystallization, rare in such good form. It stands on its own merits as a value and a fine quality; but as a bonus it also is illustrated in the Mineralogical Record book on the Weill collection. 500 grams.