Alkaline, Chalcogen, Be-Fe, Structural properties

• Be-Fe-O-S-Si
• Be-Fe-O-Si-Y
• Be-Fe-Nd-O-Si
• Be-Ce-Fe-O-Si
• Be-Ca-Er-Fe-O-Si-Y
• transitional
• chalcogen
• alkaline
• metalloid
• multinary
• hexagonal
• monoclinic
• cubic
• orthorhombic
• triclinic