Powder Snow

Powder snow is a trap block that, $$, can be obtained from cauldrons.

Obtaining
$$, a cauldron in a snowy biome will fill up with powder snow when it is snowing. Powder snow can then be picked up from this cauldron with an empty bucket.

Using a powder snow bucket will place powder snow. Placed powder snow can be picked up again with an empty bucket.

Breaking
Powder snow does not drop anything when mined, even with Silk Touch, and tools do not speed up mining.

Powder snow will be broken by water or lava.

Usage
Entities (except rabbits, endermites and silverfish) fall through powder snow without taking fall damage and move much slower in it, similar to cobwebs. Powder snow does not cause suffocation damage.

Mobs, armor stands or players wearing leather boots do not fall through powder snow. In this case the snow behaves as scaffolding when the player sneaks or crouches while on the block and jumps while inside of the block. In addition, fall damage will be taken when falling on powder snow from a large height.

Powder snow extinguishes any entities that are on fire if they go inside of it. Players can use powder snow in the Nether.

Freezing
When an entity is inside a powder snow block, they will begin to freeze, taking damage.

When a player is submerged, they will see a frosty vignette slowly fade in at the sides of the screen and the FOV will slowly decrease. After fifteen seconds (300 game ticks), the player's hearts will change to a cyan frosty texture, and the player will begin taking damage at a rate of HP every three seconds (60 game ticks). If the player leaves the powder snow block, the vignette will slowly fade away. When a player is frozen, they will move slower than usual until the vignette fully fades away. This is controlled by the "TicksFrozen" data tag, which increases by 1 every tick (to a maximum of 300) for an entity within the powder snow block. It will only decrease when the entity leaves the powder snow block, at which point it will decrease at a rate of 2 per tick. This is currently not a separate effect when used with commands such as /effect give freezing, and does not have its own unique art, particles or potion.

Wearing any piece of leather armor will stop the freezing effect and damage. This applies to entities that can wear humanoid-oriented armor, such as zombies. However, horses will not receive freezing resistance from leather horse armor, which has been confirmed to be completely intended.

Cold-sensitive mobs, namely blazes and striders, are not immediately damaged by powder snow. Mobs which inhabit cold biomes (as well as snow golems, which are themselves made almost completely of snow) are not immune to freezing.

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Trivia

 * "Snowier Snow" was announced to be part of the Mountains biome in the biome vote at MINECON Live 2019. Powder Snow is referred to as "Snowier Snow" by the community and the Mojang devs.
 * This block does not evaporate in the Nether.
 * Powder Snow could be a reference to a bug in (version needed) where snow carpets could be placed over lava pits where you could pass through. (please verify)