I want to start by saying that my previous coal dealer is a good reliable guy and carries very good coal.
I got a delivery from him the year before last that I had been waiting for a while to get. It was summer and I was in no particular hurry but I didn't want to get forgotten so I called him again to request delivery. He must not have gotten his new shipments of coal for the season so what he delivered was a mix of pea, nut and stove size coal. All the wood in it told me that he has scraped the bottom of the bins to get me the three tons I had requested.
He has the same stove I have and so he no doubt knew that my stove would burn all three sizes of coal and wood splinters just fine, which it does.