Redstone Ore is one of several ores in Minecraft. Redstone ore is found deep underground, usually between the y layers of 4 to 16. Redstone ore will drop redstone dust upon being mined. It can only be mined with an iron pickaxe or higher.

Redstone Ore
Coal Ore / Iron Ore / Lapis Lazuli Ore / Redstone Ore / Gold Ore / Diamond Ore / Emerald Ore / Nether Quartz Ore / Ruby Ore