This is a sharp, very gemmy and translucent crystal cluster showing the gemminess and luster that make these cassiterites so desirable. IT IS RAZOR SHARP! You can see if you look for it, the twinning plane...this is the only such complexly twinned example I have seen from here. The angles and geometry are MORE mesmerizing in person, even. For overall aesthetics, this is just a superb miniature. You could not really ask for more in one of these, in this size range. This small and remote deposit has produced the gemmiest cassiterites of China, and since the old Bolivian material of olden days. But, it remains seldom known and specimens very few compared to those from Ping Wu in Sichuan Province - which have another habit entirely. NOTE last shot shows the piece strongly backlit.