The Crystal Mountain is located between the White Desert and the Black Desert in Egypt. This video shows the quartz crystals that are scattered everywhere on the mountain.
We did a day-trip into the White Desert in the winter of 2016. We found out later that a trip like ours was technically “illegal” though the tour company reassured us that it wasn’t. Some Mexican tourists were killed on a tour like this the September before our trip when they were either shot or bombed by the Egyptian military (sources vary in terms of what actually happened). The Crystal Mountain, White Desert, and Black Desert were really incredible as far as tourist destinations go, but there was definitely tension in these parts when we visited. Rural areas are always a little scarier than the bigger cities in Arabic countries, at least in our experience.
The White Desert in Egypt (video)