Blocks of coal coke are blocks made from coal coke.
Blocks of coal coke can only be mined with a wooden pickaxe or better.
Blocks of coal coke can be used to store coal coke in a compact way.
When used as fuel in a furnace, one block of coal coke lasts 1600 seconds, which is enough to smelt up to 160 items. It lasts slightly longer than 9 individual pieces of coal coke.