Ice

Ice is a new block added in Version 1.0.4 (See Patch History). It is one of the two new environment-based blocks (the other is Snow). It is clear and in some ways resembles glass. It occurs at the top of any body of water in Winter Mode and is slightly slippery.

Properties
Ice can be destroyed easily and yields nothing. When it is destroyed it reverts back to water if it has a block beneath it, otherwise it will break leaving empty space. If it remains exposed to the falling snow it will turn back to ice. It can also be melted by putting a torch next to it (placing a torch on it is not possible). Placing a torch underneath an ice sheet will melt the ice surrounding, including on top of, the torch. A torch will also keep ice from forming within a 2 block radius and 3 blocks directly out, and melt in a 1 block radius and 2 blocks directly out. Active furnaces, lava, and fire also melt ice.