Here we see an excellent defined, single Quartz crystal as so-called Herkimer "Diamond". The large crystal is razor sharp, superb doubly terminated and so far I can see pristine all around. The luster is insane good and the prism faces are showing a nice horizontal striation. Despite the Quartz is gemmy, it has micro-cracks inside, what makes the crystal lucent to the first look. In any case a super aesthetic piece in splendend condition.