This is a massive arborescent cluster of acanthite on matrix! Complete all around and just impressive as hell: Charlie Key's reply at the show, when shown the piece, was "oh shit" - and that is a typical reaction. For Mexico it would be a killer already. For this new find, it blows away any other I have seen, and also beats any Mexican acanthite except maybe one I na museum, that I know of. Hefty piece, as it weighs 1145 grams. Comes with custom lucite base for easy display.