Chalcogen, Crystalline structure, Fe-Mg-O-Si, Orthorhombic

• Al-Fe-Mg-O-Si
• Al-B-F-Fe-H-Mg-O-Si
• Ca-Fe-Mg-O-Si
• Al-Fe-H-Mg-O-Si
• metalloid
• transitional
• alkaline
• chalcogen
• disordered