The recipes for prismarine bricks, dark prismarine, and sea lanterns have been tweaked to be more consistent with other blocks.
Additionally, prismarine can now be stonecut into prismarine bricks.
Prismarine bricks are now made like every other brick in the game, instead of being 9 prismarine shards.
Dark prismarine is now made from 8 prismarine and an ink sac, instead of 8 shards and black dye.
Sea lanterns are now made from 4 crystals, rather than a weird mish-mash of shards and crystals.