Talk:Coal Chunk/@comment-121.45.108.5-20120715095402/@comment-5302300-20120719185457

It's also cheaper. A diamond is 8192 EMC, coal is 128 EMC, flint is 4 EMC, and obsidian (the cheapest of the three options) is 64 EMC. It takes 64 coal (8 coal per coal ball, 8 coal balls per coal chunk) and 64*128 EMC is 8192 EMC. This means the flint and obsidian actually add on to the price.