C, Temperature for congruent melting, Tetrahedron 4-vertex

• C-H-N-O
• C-F
• C-Cl
• C-Si
• C-H-N-O-P
• non-disordered
• chalcogen
• organic
• pnictogen
• monoclinic
• triclinic
• orthorhombic
• tetragonal
• trigonal