^^^

Blue Ooids can be found at the lv 60 Mining Nodes in the Dravarian Hinterlands, the nodes that have Hard Silver Ore. The way it works is that for every node you deplete there is a small chance that a "Concealed Node" will appear, you will receive a notification kinda like when you sell an item on the Market Board. You won't have to uncover the Blue Ooid on the first try, it be visible, gather the Blue Ooid and deplete the node by gathering the Clusters. Then move onto the next node. On average you're supposed to get 4 rare item per Favor.

A small trick is to deplete 4 of the 6 surrounding nodes to just 1 hit remaining , activate the Favor then collect from those 4 nodes. You'll save yourself the time for 12 - 15 swings. Run the clock out completely, even if you deplete the last node with 3 seconds to spare and the concealed node appears, it will not vanish when the time runs out