You can convert them into Veiled Crystals if you have an enchanter by crafting Sinister Combatant’s Etched Vessel L3 (40 UM ink, 10 Viridescent ink, 1 expulsom). It’s definitely not a very efficient way of getting rid of it, but if you’re really desperate for crystals/shards or just don’t want to straight up vendor the inks, there you go.
P.S. Be sure the enchanter has their tools of the trade while disenchanting those, it increases the overall yield of all disenchanting by quite a lot.