What we have discovered is a veritable goldmine of research notes about the crystals from the "diamond" mountain, Oshu'gun. It would seem that everything in this region carries with it some residual powder of the Oshu'gun crystals. If you find any powder while adventuring in this region, return it to me and I shall reward you with a token of my appreciation which you may use to make purchases from the quartermaster.
Wonderful, <name>. This will help us in our battle against the <Alliance|Horde> filth that have surfaced in the Outland.
I thank you for your contribution, <name>. Should you find more, you know where to bring them!
Same quest for both factions, only the names have been changed to protect the innocent. The researcher you talk to is only available when your faction controls Halaa, and is found in one of the larger buildings on the mesa.
Patch 3.1.0 (14-Apr-2009): reduced number of powder samples required from 20 to 10