Chalcogen, Disordered, Non-disordered, Mohs hardness

• Fe-S
• Fe-O
• Al-Ca-H-O-Si
• Al-O
• Ca-H-O-S
• chalcogen
• disordered
• non-disordered
• transitional
• metalloid
• cubic
• monoclinic
• orthorhombic
• trigonal
• tetragonal