Blocks of charcoal are blocks made from charcoal.
Blocks of charcoal can only be mined with a wooden pickaxe or better.
Blocks of charcoal can be used to store charcoal in a compact way.
When used as fuel in a furnace, one block of charcoal lasts 800 seconds, which is enough to smelt up to 80 items. It lasts slightly longer than 9 individual pieces of charcoal.