So I just found this. 
Anything specific you want those Crystals to be? I also noticed Gloomstone in NEI and need to know if its just a different Type of Glowstone or not. ^^
Edit: Also I should mention that your Bucket/Fluid are both a little bit wonky. The Bucket requires NBT to function (I was able to deal with that somehow, still ugly hax though), while the Fluid() somehow does not have an Icon when rendered by “normal mods” while being perfectly rendered with GT6.