To illustrate this approach, and keeping in mind the C4 tetrahedron building block of diamond, a simple arrangement of 8 C4 tetrahedra at a cube corner and center is shown in Fig. , with both ball-and-stick and tetrahedral representations exhibiting corner-sharing tetrahedra. The resulting body-centered tetragonal (bct) structure C 4 submitted to quantum mechanical calculation within the Density Functional Theory (DFT) to obtain the ground state energy and related properties was found to be another formulation of diamond, and the allotrope is qualified with dia topology (Table ) . Using bct C 4 as a template, we devised novel simple allotropes, such as the latest one: hybrid (sp 3 /sp 2 ) C 6 with tfa topology, which we called "neoglitter" (cf. and the works cited therein).