Ann: RC Drilling Intersects Thick Intervals of LCT Pegmatite, page-34

as i am not a chemist i can only add something here as an amateur.
Eucrytite is a secondary alteration product of spondumene.
Its occurrence is in lithium-rich pegmatites.
beeing an alteration form of spodumene, i presume that it's not so hard to process it.
I'm personally speculating on a good deposit here, which may have a high tonnage.
given by the huge pegmatite intervals over 100m.