Yes, that's right, it's the new snack food that all Rubi-Ka craves!
No, seriously.
Everbody finds these things -- Notum Fragments, Notum Chips, and Enriched Notum Nuggets. Nobody knows what they're for. They can't be cut like other gemstones. They have no tradeskill uses that I've been able to find. Are they just minor moneymakers?
It seems like they should have a use, since notum is the most valuable thing on Rubi-Ka. The description of the nugget even says "To be used in manufacturing of nano-bots."
Maybe it's a tradeskill that hasn't been implemented yet?