Prismarine

Prismarine is a type of stone that appears underwater in ruins and ocean monuments. It periodically changes color between blue and green.

Prismarine bricks are decorative blue bricks with chiseled patterns.

Dark prismarine is a decorative form of prismarine; it is dark green, with a tight grid pattern.

Breaking
Prismarine only drops itself when mined with a pickaxe. If mined by any other tool, it drops nothing.

Natural generation
All types of prismarine naturally generate as the main blocks making up ocean monuments. Normal prismarine and prismarine bricks are found in large amounts due to the size of the structure. Prismarine bricks make up the 23 pillars below the monument, and appear decoratively throughout the structure. Dark prismarine encases the 8 gold blocks of the dungeon, and appears in fewer decorative features. Normal prismarine can also be found in underwater ruins.

Crafting
Each type of prismarine can be crafted using varying amounts of prismarine shards (and an ink sac or black dye in the case of dark prismarine). All of these resources can be obtained from underwater mobs.

Usage
Prismarine can be used for decoration or as a high blast resistance building block.

The normal prismarine is uniquely useful for decoration as it has an animated texture. The cracks in prismarine slowly cycle in color through light blue, green, purple, and dark blue. The full animation for the prismarine texture changes color 22 times in an irregular sequence before the whole pattern repeats; this takes 5 minutes and 30 seconds.

Conduit power
Prismarine, dark prismarine and prismarine bricks can be used to activate a conduit by building a structure around it. By doing this, the conduit emits the "Conduit Power" effect in a certain radius, depending on how many blocks are used to power it. Sea lanterns can also be used for this purpose.

Note Blocks
All types of prismarine can be placed under note blocks to produce "bass drum" sound.

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Trivia
"I picked Prismarine because 1) it sounds good, 2) it references water with "marine", 3) it references its "shimmering effect" I hinted at with "prism", and 4) it doesn't really mean anything in the real world."

- Jeb about the name


 * The name "prismarine" was created by the now-deleted Reddit user AjaxGb during a naming contest, where Jeb was looking for a name for the block.
 * The tiling created by prismarine bricks somewhat resembles the prismatic pentagonal tiling, although with most pentagons skewed.