[Suicide Junkie]

If you want to prevent certain racial techs from being learned by other races, Do this:

Add another tech requirement, and make it the pre-requisite crystal tech (the one that is still a racial tech area)

So, the Shard cannons would require only "crystal weapons" tech, and be stealable, but the facilities require the tech area that you can't steal (crystallurgy, i think), so you can't build them!