Board Thread:Questions and Answers/@comment-92.192.67.61-20130504124440/@comment-8540798-20130508220009

Have you got the Minium Stone in the top-left, and charcoal in the other two top slots, and center-left and -middle slots? If that doesn't work, and you have Applied Energistics, Encode the Crafting Recipe onto a Blank Pattern, place it in your Molecular Assembly Chamber, and Craft it from your terminal that way. That's what I had to do to Transmute Iron Ingots.

And yes, it is an actual recipe. It's at the top of the Coal page on this Wiki if my memory serves me.