Have noticed that when using 4x certus quartz crystals to make a single block (which breaks back down to 4x crystals), then using certus quarts blocks to make certus quartz bricks, the bricks only break back down to 4x crystals, not 4x crystal blocks, so it takes 16x crystals to make 1 brick block but that same brick block only breaks back down to 4x crystals causing a net loss in crystals.

Disregard, just saw that 4 blocks makes 4x brick blocks, math checks out I was just being dumb, need coffee