Charged quartz crystals
There were Quartz Crystal nodes available around the Labyrinthine Cliffs during the Bazaar of the Four Winds Living Story release.
Players who completed the achievements for this segment were rewarded a permanent Quartz Crystal node in their home instance. The node can be mined once per 24 hours per account and can – rarely – drop 1 Charged Quartz Crystal in addition to the regular Quartz Crystals.
After the Bazaar of the Four Winds concluded, these home instance nodes became the only source of Quartz Crystals. This was the first (and, so far, only) attempt by ArenaNet to add home instance expansion/customization to the game.
So many souls, so little time. ~ Kraag Deadsoul