This is one of the best of these rare 4-phase inclusion Quartzes I have found in the last 6 years of selling them. It has a bright glassy lustre, the internal yellow and brown are striking. It is over 4 centimeters long which for this location is as long as I've ever seen one. It has 4 independent moving bubbles. It is incredibly fluorescent! It comes mounted on a beveled acrylic base, and has only a bit of a scuff on the back side that is not seen when displaying it. 

It is a four phase inclusion in a double terminated Quartz crystal found in central Pakistan 6 years ago. 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. The gas bubble forms 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.