Dark Prismarine Slab — Minecraft block

Overview

Dark Prismarine Slab counts as an underwater block in Minecraft 1.21.4. A crafting table turns its ingredients into Dark Prismarine Slab. Its hardness of 1.5 makes it a normal, unhurried block to mine.

Anything below a wooden pickaxe breaks it without leaving a drop. It drops as the same block you mined. It stacks to 64.

You make it with Dark Prismarine. You can also cut it from Dark Prismarine on a stonecutter. It is not used in any crafting recipe.

How long it takes to break

Dark Prismarine Slab sits at hardness 1.5: 7.5 seconds per block with your fists, 0.25 with the correct netherite tool.

An iron tool takes 0.4 seconds and a diamond one 0.3, so the jump that actually matters for this block is the one to diamond.

It will break below wooden, and you will get nothing for it. That combination of time spent and drop lost is the classic mining mistake.

Efficiency contributes its level squared plus one to tool speed, which makes Efficiency V roughly 2.5 times faster than the plain tool.

* breaks the block but yields no drop
Tool	No enchantment	Efficiency III	Efficiency V
Hand *	7.5 s	7.5 s	7.5 s
Wooden	1.2 s	0.2 s	0.1 s
Stone	0.6 s	0.2 s	0.1 s
Iron	0.4 s	0.15 s	0.1 s
Diamond	0.3 s	0.15 s	0.1 s
Netherite	0.25 s	0.15 s	0.1 s
Golden	0.2 s	0.15 s	0.1 s

Properties

Dark Prismarine Slab resists blasts at 6, which usually is not enough when something explodes nearby. Light does not pass through it, and it emits none of its own. 64 fit in a slot — a full stack. The block is tagged for pickaxes, and only that class gets the speed bonus; everything else mines at bare-hand rate. As furnace fuel it burns for 7.5 seconds — 0.8 smelting operations.

Transparent: No
Required tool: Wooden Pickaxe
Fuel value: 7.5 s