Ca-Mg, Chalcogen, Structural properties, Tetragonal

• Ca-Mg-O-Si
• Al-Ca-Mg-O-Si
• Al-Ca-K-Mg-Na-O-Si-Sr
• Al-Ca-Fe-H-Mg-O-Si
• Al-B-Ca-F-Fe-H-Mg-O-Si-Ti
• chalcogen
• alkaline
• metalloid
• disordered