Redstone Ore is an item added in 0.1.0 but not placeable until 0.5.0. It is used in various crafting recipes such as a Powered rail or a normal Rail. It drops several dust when mined.
You obtain redstone from Redstone Ore. Before 0.8.0 when mined, it would just break & not drop anything.
Compasses are made using iron ingots and redstone
Clocks are made using gold ingots and redstone
- In Minecraft for PC and Xbox 360, Redstone is used as a power source.
- In a later update more redstone functions will be added.