This is a Hashupi quartz crystal of high quality.

Hashupi quartz crystals of high quality are a very rare type of Himalayan crystals, the higher the quality the higher the difficulty to get them, not only because of climate conditions and high altitudes, that makes miners only extract them for a few months a year but also because crystals of such high quality  have been very hard to find in the mines.

Optical crystals are crystals that are water clear, we can easily see through them and are also crystals that have reached a very high state of evolution.

Although this crystal doesn't seem completely optical, this is due to the prominent growth lines, but most of the faces are water clear, you can have an idea by watching the video, but its even more evident by seeing it in person.

You can read more about the characteristics of this crystal and others in the section, "Crystal Characteristics".

This crystal comes from Hashupi mine,  in  Shigar Valley, Shigar District, Gilgit-Baltistan, Pakistan.