Packed Ice

Packed Ice is a solid block found in the rare Ice Plains Spikes biome. Packed Ice blocks look similar to regular ice blocks, but are not transparent. They can be obtained using any tool with the silk touch enchantment. When they are broken with a non-silk-touch-item, no water source block is created, unlike normal ice. Packed Ice also does not melt near light sources, like normal ice does. However, it is slippery like normal ice. It's intended purpose is currently unknown, although it can be used as decoration, for faster travel or for item slides, just like normal ice.