Lightning Crystals...

...what are they good for? I finally worked my way up to a stack, but they only sold for 500 gil in Windurst, not much more than the much more plentiful Earth crystals. I've looked up the crystal on allakhazam, and can't find any crafting recipes that I like (or that I can use with my low crafting levels)

What about gardening? If I feed something a lightning crystal, will I be able to harvest anything worth harvesting? What kind of seeds would I need, and are they available in Windurst without hitting the AH? (Sandy or Bastok would be OK, too, since I'd like to hit Valkurm for a while this weekend and level my whm as a break from all of the gil farming I've been doing with my thf in Windurst...but Windy would be more convenient, since that way I can get rid of the 5 crystals I have immediately--I need the safe space.)

Wow 500? LOL

Its for desynthing and for things to split like clothcraft, two moko grass+Lightning=one grass thread, very useful thing. Shellshield+Lightning=Femur and a turtle shell for smithing desynthing, real nice.