Cymatygen is a rare Element in No Man's Sky obtained from worlds in Blue Star Systems.
Cymatygen has no uses in game at this time.
Where To Obtain
Here is a planet where Cymatygen can be found that only requires the first 2 Portal Glyphs to dial:
It is a Low Bio-Hazard Planet with High levels of Fauna, a fair amount of which is aggresive, it's Flora is medium.