A gorgeous, sharp, cassiterite crystal with jet black color and breathtaking lustre for the species. This thing is so sharp and bright you can see your reflection from its major faces. For Brazil, such quality is incredibly rare, though has been reported occasionally. This is surely an older specimen, and was in the collection of Lawrence Conklin. The bottom is sawed where it was removed from matrix, though it sits well because of this. Sadly, the piece is repaired once, with the far 9mm or so of the most overhanging and exposed corner having been reattached. It is a good repair, not visible as it sits on the shelf and only seen with closer inspection, but still a repair that decreases value (I had estimated this at $2000 previously). Nevertheles, a highly important and rare, very showy, locality piece for this species