I first noticed these specimens trickling onto the market a couple of years ago, at outrageous but tempting prices - crystals are some of the biggest and sharpest octahedrons I have seen; just above my normal budget. More are now available and there is a little more range in prices... this was a lucky find! Part of the back is contacted and there are spme minor chips, but overall this shows really well. Biggest crystal is 1.4 cm. on edge. From the Rubtsovskoe Cu-Zn-Pb deposit, Rudnyi Altai, Altaiskii Krai, Western-Siberia.