"...I'm going to need a bigger crucible is what I'm hearing." To form and cast stone like metal- he flicks through the chemical compound of the listed materials and- he can't see how that'd come together to make anything so strong. Maybe it's in the ratio or heat treating? Running the math will take awhile going longhand. At least he won't have to figure it out with no direction (a la badassium, thanks dad), he'll have an outline and an expert. Could be worse. "I've got charcoal and space on the wall in the forge. Come by anytime and talk me through it."

It'll be useful and possibly cut down on the rest of everything else they'll have to carve from the forest, leaving wood enough to keep everyone warm come winter.