Nice big quartz crystal. Transparent and very few cracks inside. Clear on the top and more white on the bottom. There is a big area on the backside that is missing, but if you study it closely you will see that it is nature's damage/deformation, and not man-made.

Please watch the video for a better view:
https://youtu.be/JZDcz2HDwf4

This is an old specimen, probably collected around 30 years ago.