These a huge stones that have writings on them. The first one I found had a glowing alien glyph on it that kind of looks like flowing plasma in the old 80's sci-fi horror movies.
I found this whilst exploring the new world after the prologue enforced death and discovering work space which housed an fabricator and also a locker for sharing resources with other online players.
Holding down Triangle will allow you to scan it and record it in your log.