Powder Snow

Powder snow is a trap block that can be obtained from snowy slopes and groves biomes.

Natural generation
Powder snow naturally generates in groves and snowy slopes.

Cauldrons
A cauldron in a snowy biome fills with powder snow when it is snowing. Powder snow can then be picked up from this cauldron with an empty bucket.

Bucket
Using a powder snow bucket places powder snow. Placed powder snow can be picked up again with an empty bucket. When picked up, breaking particles appear.

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

Powder snow is broken by water or lava, or when shot with a Flame-enchanted bow.

Usage
Entities (except rabbits, endermites, silverfish, shulkers, vexes and foxes) 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.

Most walking mobs (except for goats) treat powder snow as normal solid blocks while pathfinding, similar to trapdoors, allowing them to voluntarily walk into it, and fall through it if possible. Goats avoid powder snow, and they are not immune to falling through it and taking freezing damage.

If an entity that is on fire touches powder snow, powder snow cools it down as the powder snow melts.

Being fully inside a block causes a thick fog effect around the point of view.

Placing a Carpet on Powder Snow also prevents Fall damage without being submerged into it. In Bedrock Edition, this setup doesn't allow entities to jump on it.

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

A player submerged in powder snow sees a frosty vignette slowly fade in at the sides of the screen and the FOV slowly decreases. When the vignette is fully shown, the player begins shivering visibly. After seven seconds (140 game ticks), the player's hearts change to a cyan frosty texture, and the player begins taking damage at a rate of HP every two seconds (40 game ticks). When an entity dies of freezing damage, a message will appear, saying [entity] froze to death. If the player leaves the powder snow block, the vignette slowly fades away. A frozen player moves 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 140) for an entity within the powder snow block. It decreases at a rate of 2 per tick after the entity leaves the powder snow block. This is currently not a separate effect when used with commands such as, and does not have its own unique art, particles, or potion.

Wearing any piece of leather armor stops the freezing effect and and reverses the damage. This applies to entities that can wear armor, such as players, zombies and horses wearing leather horse armor. If the leather armor is put on while the entity already has the freezing effect, the effect fades away the same as if the entity exited the powder snow.

Snow golems, strays, polar bears, withers, and ender dragons are immune to freezing damage. Fire-related mobs like striders, magma cubes, and blazes take from freezing.

Skeletons turn into strays instead of taking freezing damage.

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Trivia

 * The block was announced as “Snowier Snow” at MINECON Live 2019, and is still often called that by Mojang.