Fe-Mg-O, Structural properties, Triclinic

• Ca-Fe-Mg-Mn-O-Si
• Al-Fe-H-Mg-O-Si
• Ca-Fe-Mg-Mn-O-Si-Zn
• Al-Ca-Fe-H-Mg-Mn-O-Si
• Al-Ca-Fe-Mg-O-Si
• chalcogen
• transitional
• alkaline
• disordered