Alkali, Sulfate, Fusion

• Fe-H-K-O-S
• H-Na-O-S
• Fe-H-Na-O-S
• H-Li-N-O-S
• H-K-O-S
• temperature for congruent melting
• sulfate
• alkali
• chalcogen
• non-disordered
• monoclinic
• orthorhombic
• trigonal
• triclinic
• cubic