yes i got the words mixed up
you meant "burns slower than wood but faster than coal"?
so it burns slower then coal and faster then wood ? (i am 99% sure that coal and wood need to be switched)
so just.. petrified wood?
Yea, as BoneDevourer said, coal+wood mixed materials are nothing new, although the original material was made before sawd, and instead included powders to act as ash.
This is a known technique ID:1006408
you've solved the ancient debate, to grill with coal or with wood