Van der westhuizen

• Al-H-O-S
• Cu-H-O-Pb-V-Zn
• Al-B-H-O-Si-Ti
• B-C-Ca-H-Mn-O
• Fe-Mn-Nb-O-Ta-Ti-W
• structural properties
• chalcogen
• transitional
• multinary
• metalloid
• quinary