"the eagle hunt" from Kaimo Bleigh pays 10 shatterstar ore boxes per quest, so 100 per day. each box randomly gives 1 to 3 shatterstar ore (wind, water, voidal, earth or fire). there may be attunement required for this quest.
"maintaining the seal" from Mag Neigh requires four of each type of shatterstar ore and pays 1270336 xp which i believe is the highest paying daily in game. there are many other dailies paying same xp but require different amounts of ore. this configuration seems the most straighforward.
public event quests give ore as well.