seriously guys... aetherial reduction like Roth said, you will never run out of crystals/clusters again. All the lvl 60 gathering spots have one ephemeral node thats visible for 4 hrs each day (in game time). Gather the ephemeral node's items as collectables (1 appraisal is enough for shards, for clusters you need 300+ collectability) and use aetherial reduction on them. Miner nodes have either Fire or Lightning element, Botanist nodes have Wind/Earth. Ice and Water is from fishing i guess. Use google to find which time/location for which element.