No Man’s Sky Expedition: Cartographers Complete

In my last post talking about the new No Man’s Sky, Expedition Cartographers.  I was stuck on one milestone.  It has you looking for 18 minerals.  But I can only find 17.   You need all 18 to unlock the milestone which gives you the part you need to fix your ship.  However where was another way to get the part need.  Did that but it took a really long time, about 30 minutes.  Because I had to drive in exo-craft.  Once I had the ship fixed.  Went to another planet just to scan that one last mineral.  After that went pretty quickly though the last of the milestones.