Conan Exiles Here are 4 Crystal Cave Locations
Here is a video showing you where there are 4 caves that I know of that you can gather crytals. Even a newbie can start gathering the crystals as 2 caves are near the starting area. There are other ways to gather crystals, but that is for another video.
dailymotion.com/variousthingsandstuff
dailymotion.com/variousthingsandstuff