Powder Snow

Powder snow is a block 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 a bucket.

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

Powder snow can be picked up with a bucket.

Usage
Entities (except rabbits, endermites and silverfish) fall through powder snow without taking fall damage and move much slower in it, similar to cobwebs. Despite being a full block, it does not cause suffocation damage. A player whose head is within the block sees a frosty vignette decorated with snowflakes.

Powder snow can be used to make technical farms, instead of water.

Mobs 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.

Like water, powder snow extinguishes any entities that are on fire if they go inside of it.

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. 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.

Wearing leather armor is intended to slow the freeze effect, and a full set of leather armor is intended to stop the freeze effect. However, this feature was not implemented properly and does not work.

Cold-sensitive mobs, namely blazes and striders, are not immediately damaged by powder snow. This has been confirmed by Mojira moderators to be not a bug. Mobs which inhabit cold biomes (as well as snow golems, which are themselves made almost completely of snow) are not immune to its freezing effects, which is also considered completely intentional.

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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.
 * When inside powder snow, the FOVs will slowly decrease, even when the player starts freezing.