Ice

Ice is a translucent solid block.

Obtaining
Ice can be easily destroyed without tools, but the use of a pickaxe speeds up the process. It can be broken instantly with Efficiency III on a diamond pickaxe. However, the block drops only when using a tool enchanted with Silk Touch. If mined without Silk Touch, the block drops nothing, and instead is replaced with water if there is a block under the ice block.

Natural generation
Ice can be found naturally as part of the landscape in snowy biomes from frozen lakes, rivers, and oceans. It can also be found in igloos, ice spikes, and icebergs. , ice also generates as part of snowy slopes, lofty peaks, also on landscape of snow capped peaks biomes.

Snowy biomes
Water source blocks in a snowy biome eventually freeze into ice if exposed to the sky from directly above, the light level immediately adjacent to the water block on all sides is less than 13, and there is at least one horizontally adjacent non-water block. This can happen at any time of day, and in any weather condition. If the highest adjacent light level is 12, an ice block alternately melts and re-freezes when it receives a block tick.

Water also freezes into ice in cold biomes, as long as the altitude is high enough for snowfall.

Ice Bomb
When an ice bomb is thrown into water, it transforms the water in a 3×3×3 cube centered around the projectile into ice. This works for source water or flowing water upon hit.

Crafting ingredient
Despite being created by a 3×3 recipe, packed ice is not a storage block, because it cannot be crafted back into ice. The same applies to the next tier of compression, blue ice.

Speed
Ice is slightly slippery, causing entities (excluding minecarts ) to slide, including items. This allows for increased speed of items in water currents, by placing ice blocks under the water current. Items already travel at high speeds in water currents because they float, so ice block water streams are less necessary for item transportation.

A player who sprints and jumps repeatedly on ice travels faster than on any other block type. The player can travel even faster if they sprint and spam in a 2-block-high corridor with ice on the floor, allowing the player to accelerate to extremely high speeds, although this will cost them a lot of hunger.

When a non-full block is placed on top of ice, the block has the same "slipperiness" as the ice below it. This feature is intentionally programmed into the game.

Boat highway
Like other entities, boats travel extremely quickly on ice, where it can reach an average speed of 40 m/s, much faster than the 8 m/s speed on water. More beneficially, unlike water, ice can be placed in the Nether, allowing players to construct boat highways made of ice in the dimension, to make use of the 1:8 distance travel ratio, and travel at a speed equivalent to more than 300 m/s between locations in the Overworld.

Creating water
Ice can be used to create water either by its melting or being broken. If there is another block directly underneath the ice block, the ice reverts to water when broken.

Ice also melts into water if the light level immediately next to it on any side is higher than 11, from light sources other than sunlight, but ice does not melt from sunlight. $$, ice also melts when near a heat block, though heat blocks do not produce light.

If ice melts or is broken in the Nether, no water is produced.

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Trivia

 * When riding a pig on ice using a saddle, the pig moves incredibly fast, making journeys across long-frozen lakes easier.
 * By sprinting and jumping while on ice and inside a 2-block tall tunnel, it is possible to move 16 blocks a second, twice as fast as a full-speed minecart. By replacing the 2-block ceiling with trapdoors, it's possible to travel 1000 blocks in 54 seconds, or 18.518 blocks per second. However, this drains the player's hunger bar extremely quickly at roughly 1 unit per second.
 * Sugar cane can be generated next to the ice, though they drop as items if updated. This can be observed at random when running through a snowy biome.
 * Attempting to set ice on fire with a flint and steel causes no flames to appear, but the flint and steel's durability still decreases by 1. The same thing happens with glass and the sides of non-flammable blocks.
 * Ice is classified as a transparent block and therefore does not conduct redstone.
 * Snow layers are the only transparent block that cannot be placed on ice.
 * When a player holds an ice block, the normals of the smaller model are flipped inside out, giving a strange effect.