It's craftable as well with coal and Nether Quartz.
Just like Hardened Stone from Environmental Tech. You can make it, but you won't find world gen of it.
While I can see the reasoning behind some of these changes (thank you for turning off AE2 Meteors and giving us a recipe for presses) in world gen etc (gearing up for expert mode I suspect) I'm disappointed the FTB team has decided to gate some mods behind traveling to the Neither on the bog standard kitchen sink version of the pack.