This is a vary Large example of this uncommon form of Quartz (the largest one I have ever seen). It is a four phase inclusion in a double terminated Quartz crystal found in central Pakistan within the last year. It is highly fluorescent under both short wave and long wave (LW pictured). The long wave makes the petroleum fluoresce yellow, the short wave brings out the more reds and blues.  There are a couple bubbles, with one prominent one in the center of the crystal that freely moves. The gas bubble formed when the the Quartz cools after forming, the petroleum contracts more than the Quartz because it is less dense, it pulls a vacume within the fluid thus creating a "gas" bubble.  The four phases are: the gas bubble trapped in the petroleum, the petroleum itself, a darker brown previously organic material, and black carbon inclusions. I learned this from an insightful geologist who specializes in Quartz inclusions, whom I met at the Tucson Main show in 2010. It has a little scuffing or contact on onevertical face. Overall in good condition, especially for such a large example.