Thanks very much guys for the fast replies to my post!
I am happy to know how active this forum operate.
Yes I haven't finished the quest, because I don't know how to finish it.
If I open the map from the quest, then I only see a blank map with "???".
I don't know where to find that specific node.
I read on lodestone about the quest and as far as I understand, I just have to equip the ability and use my skills to make out random nodes to harvest random catalyst to fnish the quest.
I had mined approximately 20 times near the location, whereI received the quest, but then I was fed up and looked at Lodestone about the recommended location to find catalyst and traveed to Noscea and Black Shroud.

Do I have to harvest in Thanalan? Is the marked nodes on my quest-map a specific node and not just a random node? As I already wirtten above, I can't make out where the map indicate the "???" is.