F-x polyhedra, Fusion, Halogen

• C-F
• F-H-N
• Cs-F-Th
• Ca-F
• F-Na-O-P-V
• temperature for congruent melting
• pressure for congruent melting
• halogen
• fluoride
• non-disordered
• transitional
• monoclinic
• orthorhombic
• cubic
• tetragonal
• trigonal