Nether Bricks

"Nether brick blocks came to Minecraft in version 1.0.0 – the first official release of the game. They generate naturally in only one place – the walls and pillars of nether fortresses, where they provide protection for those inside from ghast fireballs and other dangers. Unfortunately, there's usually more danger inside the fortresses than out, as they act as spawning grounds for blazes, wither skeletons and other terrors."

- Duncan Geere

Nether bricks are blocks used to form nether fortresses in the Nether.

Red nether bricks, cracked nether bricks and chiseled nether bricks are decorative variants that do not naturally generate.

Natural generation
Nether bricks form the walls and supporting pillars of all nether fortresses.

Breaking
Nether bricks can be mined using any pickaxe. If mined without a pickaxe, they drop nothing.

Block loot
Nether bricks can be mined using any pickaxe. If mined without a pickaxe, they drop nothing.

Usage
Nether bricks are non-flammable and immune to ghast fireballs, making it a suitable shelter material for the Nether.

If a nether bricks block is inside the whole bounding box of a nether fortress (not just inside the individual parts), nether fortress mobs (such as blazes and wither skeletons) can spawn on it if other normal conditions are met. It is not known if this is an exclusive property of the block.

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Trivia

 * Similarly to the chiseled versions of sandstone, red sandstone, and polished blackstone, chiseled nether brick has a face/symbol on its texture. In this case, a wither skeleton skull.
 * Nether bricks are the only blocks that have both a fence and wall variant.