GLAS is currently a dead-end element; I would be nice to have a SLCN-based CRMC factory that's not also a GLAS factory. 1+
EDIT: I just remembered that LITH with a carbonation factor (tmp2) of 6+ turns into molten GLAS when ignited so we'll need to make it so it can't turn GLAS into SLCN if it's carbonation factor is that high.