A superb specimen with impeccable geometry to these remarkably 3-dimensional crytals. The largest crystal reaches 4 cm in size and shows nearly every possible face. I have seen a LOT of these over the years and usually to get crystals this perfectly formed or displayed, you are reduced to getting small crystals on a big matrix whereas this is the reverse, the ideal of big crystals on a pedestal of matrix! For its size, this is certainly one of the very best examples of this classic association, and it comes from a fine collection as well (I obtained it only recently, as part of his oxide and sulfide suite). 7.5 x 7.5 x 5 cm