Chalcogen, Silicate, Fusion

• O-Si
• Al-H-Na-O-Si
• Al-Na-O-Si
• Al-Ca-H-O-Si
• H-Mg-O-Si
• temperature for congruent melting
• silicate
• metalloid
• chalcogen
• disordered
• monoclinic
• orthorhombic
• cubic
• trigonal
• tetragonal