Cottonwood odd concrete ash?

[tla100]

Been burning cottonwood standing dead wood. Been seeing more than a few times ash turns to solid chunk of crystallized crappy concrete...only reason burning junk cottonwood it was by garden and I culled it years ago to keep from suckering. It blew over in big storm between shed and house

Have had it few years ago with standing dead I cut n split as I needed wood....not sure what kind of wood.

There maybe a couple Busch lattes thrown in fire also....

 

[ChoppyChoppy]

Odd.

I burn plenty of poplar and never seen that. Just light powdery ash that gets everywhere.

 

[tla100]

This has weight to it. It has been a mild year so have started a lot more fires than normal.

Has to be with cottonwood as ash and maple don't do this

 

[Husky Man]

I sure don’t go out of my way for Cottonwood, but I have burned plenty of it over the years, and I have never seen that either.

 

[Woodanhor]

Maybe minerals the tree sucked up from the soil
Have had lumber with mineral stains in it