Fe-Si, Monoclinic, Values of electronic energy gap

• Fe-O-Si
• Al-Fe-H-Mg-O-Si
• Al-Fe-H-K-Mg-O-Si
• Al-Ca-Fe-H-Mg-Mn-O-Si-Zn
• Al-Ca-Fe-H-K-Mg-Na-O-Si-Ti
• transitional
• metalloid
• chalcogen
• disordered