Chain

Chains are metallic decoration blocks.

Breaking
Chains can be mined using any pickaxe. If mined without a pickaxe, it drops nothing.

Natural generation
Chains generate in bastion remnants and sometimes in ruined portals that generate in the Nether.

Usage
Chains can be used to suspend bells or both types of lanterns (normal lanterns and soul lanterns), as the chain texture connects to the chain of the lantern seamlessly as if it was part of it. Chains do not require a supporting block to be placed whether it is on the top, next to it or at the bottom. It can exist completely free-standing in mid air but it cannot be rotated. Chains connect horizontally or vertically, but not across different orientations (so a chain with N orientation does not connect to a chain with E orientation in the adjacent block).

In 1.16.2, horizontal chains one block above a surface may be walked over. Horizontal chains two blocks above a surface prevent players from traveling past them. Vertical chains block travel if targeted directly, but may be skirted.

$$, chains can be pushed by pistons without being broken.

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Trivia

 * Chain is made out of two iron nuggets and one iron ingot, but its blast resistance is the same as the block of iron.
 * Unlike iron bars or walls, it does not connect horizontally. A solid, but not a full block, it allows for many sizes of mobs and players to pass alongside each piece horizontally. When players throw an item or a mob dies with the loot thrown into the gap, the item can pass alongside it.
 * Despite its name, it cannot be crafted into chainmail armor.
 * The chain block is actually using the top texture of the lantern.