text: The following inclusion types can also be found in aluminium alloys: alumina needles (AlO), nitrides (AlN), iron oxides (FeO), manganese oxides (MnO), fluorides (NaAlF, NaF, CaF, …), aluminium borides (AlB, AlB), borocarbides (AlCB).
  Bone ash (Ca(PO)) sometimes added to patch cracks in the trough can be found as inclusions in the melt.