With a block of coal all you can do is turn it back into 9 pieces of coal! You can make a coal block with 9 prices of coal so all your really doing is going back nad forth back and forth!
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For one cobblestone block you will only need a single piece of coal. One coal will smelt up to eight items.
A single piece of coal can perform 8 furnace operations in minecraft 1.6, so that means 8 pieces of cobblestone.
The fortune enchantment increases the amount of diamonds, lapis, redstone, coal and emeralds you get from each ore block.
The hardest block in Minecraft is bedrock. It is completely unbreakable unless on creative mode.
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