Right now, the End ores that gregtech adds are mostly useless. Here is a list of them, in order of most useful to most useless:
Sheldonite: Yellow texture, hard to spot in the similarly coloured endstone. Macerating it gives you platinum dust, which can be centrifuged for iridium. The most useful ore there, also the rarest/hardest to get at.
Tungstate: Very common, looks like coal. Gives you tungsten, which doesn't have much of a use right now (no ubertools and such, but when redpower gives a use to tungsten, it might be good to go there)
EDIT: it actually has a use in some very high end gregtech stuff, but nothing you would need it for in bulk, like it generates in the end.
Olivine: Green texture like emerald ore. It gives you 1 olivine. It can be used to get magnesium I believe. Processing it in an industrial grinder will give you 2 tiny piles of emerald dust. Needs to be a bit higher for me to bother getting it.
Sodalite: Blue texture like lapis. Definitely the most useless ore there. You'd think it might be a good source of lapis, but it's basically just a replacement for blue dye.
Right now the, the only real reason to go to the end is for the dragon and the sheldonite. All the other ores are just decoration. If greg could add a balanced way to use sodalite for lapis and olivine for emerald, things might change.
Sheldonite: Yellow texture, hard to spot in the similarly coloured endstone. Macerating it gives you platinum dust, which can be centrifuged for iridium. The most useful ore there, also the rarest/hardest to get at.
Tungstate: Very common, looks like coal. Gives you tungsten, which doesn't have much of a use right now (no ubertools and such, but when redpower gives a use to tungsten, it might be good to go there)
EDIT: it actually has a use in some very high end gregtech stuff, but nothing you would need it for in bulk, like it generates in the end.
Olivine: Green texture like emerald ore. It gives you 1 olivine. It can be used to get magnesium I believe. Processing it in an industrial grinder will give you 2 tiny piles of emerald dust. Needs to be a bit higher for me to bother getting it.
Sodalite: Blue texture like lapis. Definitely the most useless ore there. You'd think it might be a good source of lapis, but it's basically just a replacement for blue dye.
Right now the, the only real reason to go to the end is for the dragon and the sheldonite. All the other ores are just decoration. If greg could add a balanced way to use sodalite for lapis and olivine for emerald, things might change.