Neon Quartz

It is mined from Neon Quartz Ore in the Nether with a stone pickaxe or better. There is no other source.

For the Neon colorway put a dyeable cosmetic and 2 Neon Quartz into a crafting grid. The item gets cyan, magenta, lime and violet stripes whose colors flow from stripe to stripe in a 7-second cycle, and loses the dye and colorway it had. 32 items take it: all dyeable cosmetics except backpacks and pet outfits.

Four Neon Quartz go into the Neon Sign recipe, which gives 2 signs.