Here is another recipe I found on FFXIclopedia:
Alchemy (42)
Earth Crystal x1
Djinn Ash x1
Sulfur x1
Yield: Firesand x4
HQ1: Firesand x8
HQ2: Firesand x12
I hope this helps out. Have a nice day.
Edited, Jul 11th 2009 4:48pm by chancelleous