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Chalcogen, Fusion, Pentagonal pyramid 6-vertex
C-H-N-O
B-H-O-Rb
B-F-H-K-O
H-Mo-N-O
H-O-Se-U
temperature for congruent melting
chalcogen
non-disordered
transitional
alkali
monoclinic
orthorhombic
triclinic
tetragonal
hexagonal