Fluix Crystals
Make Fluix Crystals by tossing a
Charged Certus Quartz Crystal,
a 
Redstone,
and a 
Nether Quartz
into the same Water Source block. They will merge and form
2 
Fluix Crystals
and you will get an Achievement. We need 4 Fluix Crystals so go ahead and toss all the items in the water source block.