The thread on the IC2 Addon thread is found
here. It has a link to the Direwolf20 Mod Spotlight, which goes into some detail.
Basically, Forcium around a diamond makes a forcium crystal which is a component in making MFFS machines. You can NEI that. Forcium is also fuel in MFFS machines to power the force fields themselves (requires a LOT of Eu to generate it as well).