Stoned...

It absolutely is. I have seen all kinds of combustibles pressed and even mixed into clay. Of course this is for out door firing.
 
You will often be surprised that the rocks that seem the best are not and those that seem hopeless perform very well. Rocks are like people, or are people like rocks?
 
I’d imagine charcoal shard pressed in, would burn OUT hotter and slower.. leaving more evidence of the combustion.. maybe?
 
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