This seems to be the result of poor planning and foresight. If S-E was planning to require 40 geodes for the next level of elemental Magian trials, would it not have been somewhat considerate to the players to at least improve their drop rates on their corresponding days/weather to the frequency of crystals or other common drops?
Stoking demand without the appropriate supply (see: Mythic Weapons and Alexandrites) is a recipe for disaster and this is no exception.