I'm not sure if in the 70+ pages of this thread anyway ever posted final confirmation on where to farm these crystals, so I'll post it here on the end so it will be easier to find: Thanks to the maker of the video for your help.

I FOUND THE ANSWER!!! I stumbled upon this crystal node last night and I was curious about it too, so I spent some time scouring the internet for an answer. It can be found here: Thank you to the maker of the video for demonstrating this. Happy hunting!