Chalcogen, Trioxoselenate, Fusion

• H-Mn-O-Se
• Fe-H-O-Se
• Cu-O-Se
• Hg-O-Se
• Co-H-O-Se
• temperature for congruent melting
• chalcogen
• trioxoselenate
• non-disordered
• transitional
• monoclinic
• orthorhombic
• triclinic
• hexagonal
• trigonal