Chalcogen, Monocapped trigonal prism 7-vertex, Orthorhombic, Temperature for congruent melting

• Bi-Cu-Pb-S
• Pb-S-Sb
• F-Na-O-P-V
• Ca-H-O-Si-V
• Fe-O-Sr
• chalcogen
• non-disordered
• transitional
• rare earth