Hey there, I can't speak for the other people but, What I think they are getting at is when you find a Quarts node and it's showing as it is there and for you to grab(Green glowing dot above it) and you can't grab it for whatever unknown reasons. I've ran into this alot. A few bugs here and there with the spawns.
I play with a friend and they where not able to grab the Quarts we both saw it and it was glowing green, We both had pick axes. but it would just not let her get it, it let me get it. Not sure how that works.