Ice

Ice is a translucent solid block formed in snowy Biomes (formerly winter worlds) from exposed water, and is slightly slippery.

Ice can be easily destroyed without tools, but using a pickaxe helps. You can now obtain ice block with a silk touch pickaxe since 12w17a. If there is another block directly underneath the ice block, it will revert back to water when broken. If not, it will shatter without producing water. Due to its transparency, ice cannot have Torches placed on it directly.

Ice will also melt into water if the light level immediately next to it on any side is sufficiently high (previously 12 or higher; now seems to be 13 or 14), from light sources other than sunlight. Conversely, a water block in a snowy biome will eventually freeze into ice if exposed to the sky from directly above, and the light level immediately above the water block is sufficiently low (previously 9, now far higher), from light sources other than sunlight. This can happen at any time of day, and in any weather conditions.

Items and broken blocks move extremely fast if they are in water that is flowing over ice. This is particularly useful for transporting resources using water currents because items will keep sliding on ice blocks when they are dropped at an angle, even if water is not placed on top.

Potential uses

 * If creating a water slide, ice blocks can be used as the bottom pieces of the slide to speed up item movement.
 * Because items exiting a water flow will continue to slide on up to two blocks on ice, sequences of flowing water over ice can be used to transport items indefinitely with no vertical drop necessary.
 * Items that exit water flowing over ice can slide up to nine blocks on ice.
 * In creative mode the player can place ice blocks in the Nether and use lava to make water. (before 12w17a)
 * Making a 2-block high hallway with an ice floor, sprint-jumping down it causes the fastest possible speed in the game. However, this will rapidly deplete the player's hunger bar.
 * The player can build structures with ice in a tundra biome by putting dirt (or any other blocks) around the walls that will be built. After the player lays out one level of dirt, the player can pour water into the layout with buckets until all blocks have become ice. After this, make another level and repeat. There should be no blocks anywhere above the block of water the player wants to freeze, since water will not freeze with blocks directly above it.
 * When placed on ice, Soul Sand's slowing effect will be greatly increased. This makes it helpful for live capture traps.
 * Since minecraft 12w17a you can now obtain ice blocks by mining then with a silk touck pickaxe, making ice structures relatively easier to make.

History
The Ice block was first added in Alpha 1.0.4.

As of Beta 1.8, Ice can be used to get water into the Nether in creative mode. Placing a bright enough light source next to it will cause it to melt. This was patched in snapshot 12w17a.

In Beta 1.9 Prerelease 4, mining Ice with a pickaxe enchanted with Silk Touch would cause Ice to drop, which could then be brought to the Nether as a source of water. From Minecraft 1.0 to 1.2.5, ice blocks cannot be collected with the Silk Touch enchantment.

In snapshot 12w17a, ice blocks can be legitimately be obtained in survival mode by harvesting them with a Silk Touch enchanted pickaxe. However, the ability for ice to spawn water in the Nether was removed.

Bugs

 * If one is to place a bucket of water on an ice block, and if the player is standing on it while being washed away by the water, the he/she will not be able to jump, and walking anywhere will be the same as walking on ice, making it impossible to play in any game.
 * If the user is playing on a non-snow Alpha map generated before the Halloween update, as of 1.6, oceans may freeze over because of ice regeneration in the newly generated snow biomes.
 * Lakes can spawn inside of oceans, causing a frozen ocean to have "craters" of ice.
 * It is possible to create a single block of non-flowing water by melting ice, even when there are no surrounding blocks. As soon as a surrounding block is changed, such as adding or mining a block, or placing items like torches, the water will start flowing. Examples: ,
 * If a partial block like a cake or a single slab is placed on an ice block, that block gains the slippery property of the ice block below it.
 * Ice placed in the Nether will melt into a water source block, avoiding the no water in the nether restriction. This is however only possible in creative mode or with mods. This was patched in snapshot 12w17a.
 * Using ice, it is possible to have a water source block directly above a fire block. By placing Netherrack below any solid block and an ice block above said block, then destroying the middle block and setting the Netherrack on fire, the ice will melt and float above the fire.
 * If a player creates a world that lacks ice in a given spot, and then updates their game to a newer version, ice will form over the spot if the same coordinates would be within a cold biome after the update (when using the same seed). The forming ice will appear to spread across bodies of water because each ice block that forms in the water updates the surrounding water blocks.
 * In some worlds, with outdated world generation, biomes that were previously not snowy (or even deserts) can sometimes begin to have all water source blocks converted into ice.

Trivia

 * If a player rides 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 will drain the player's hunger bar extremely quickly at roughly 1 unit per second.
 * If you place a slab on top of a ice block, the slipperiness transfers through.
 * If Soul Sand is placed on ice, it will slow the player down even more when walked on.
 * Ice isn't as translucent as glass, so light passes through ice blocks diffusely, reducing the light level by 2 per ice block.
 * Ice doesn't look transparent in the inventory or when your character holds it but will look translucent when placed.
 * Along with Portals and Water, Ice is one of the few blocks that uses translucent pixels (colored but still semi-transparent) in the default Minecraft texture pack.
 * If viewed through a portal, ice is invisible and the ground beneath it can be seen.
 * Although it is seemingly translucent, water cannot be seen through ice, nor can other ice blocks. The same thing happens when ice is placed with lava. This only occurs with blocks in close vicinity unlike water where the ice can be any distance from it.
 * It is possible to see the edges of chunks through ice, but only in "Fast" graphics setting.
 * Sugar cane can be placed on the side of ice.
 * If you try to light ice on fire with a flint and steel no flames will appear, but the flint and steel will still act as if it had been used (its durability will decrease slightly). The same thing happens with glass.
 * If an ocean biome is beside a snow biome, there can be "ice shelves".
 * Water source blocks that are flowing out in all four directions do not seem to freeze, even after many days.

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