Four years ago I bought a load of firewood that had a lot of large splits with a very rich red color that’s consistent all the way through (no lighter sapwood near the edge). They were heavy, and really hard to get to burn in my wood stove (my experience is mostly with white oak, which is no problem). I wrote it off to “not seasoned enough” and put it aside. Now, they’re still heavy, still slow to start (although better), and eventually reduce to coals without throwing off a lot of flame. I’m in northeastern mixed deciduous forest, mostly oaks, ash, and maple, with some pine and hemlock mixed in. But some of the firewood for sale around here comes from orchards and tree services (which may be dealing with non-natives planted around people’s houses). I think it’s probably not cherry because most of the orchard trees would be small-ish and these splits are big, and because it seems like a good-size cherry tree would be worth more to a sawmill than a firewood vendor. Picture below. Any idea what this could be?