Earlier works in 1994 focused on a dense hexacarbon 3D tetragonal structure based on 1,4-cyclohexadiene molecule known for its uses as an effective hydrogen donor for catalytic hydrogenation reactions. The molecule depicted in Fig. consists of four trigonal carbons: C(sp 2 ) and two tetrahedral carbons: C(sp 3 ). From the schematic representation, a localization of two C=C pairs with double bonds facing each other is observed, the remaining two sp 3 carbons are placed at para (opposite) positions 1 and 4, whence the nomenclature 1,4-cyclohexadiene. The corresponding 3D structure was called 'glitter', i.e. shining due to the conductive character from the electronic band structure as it is confirmed in the development of this work (cf. Figure ). The crystal structure featuring a C6 hexahedron is depicted in Building anew on 'glitter' C 6 , the same authors proposed in 2012 octacarbon C 8 allotrope with an orthorhombic structure Ammm space group, a subgroup of Cmmm N°65 (in the next section it will be shown that the actual space group is primitive Pmmm N°57). The structure is shown in Fig. . It was called 'isoglitter' as it contains C 6 -'glitter''s C6 hexahedron with two tetrahedral C(sp 3 ), augmented with two additional tetrahedral carbons. Since there are two types of tetrahedral C, we call them C1a and C1b shown with white spheres whereas the trigonal carbons which are now differentiated due to the lowering of space group symmetry (cf. Table ) are labeled C2a and C2b. The separation between the tetrahedral stacking by pairs of carbon is like 'glitter' and a tetragonal octacarbon C 8 that was proposed in 2019 without full characterizations of mechanical and dynamic stabilities . The structure presented in Fig. shows resemblance with 'glitter' C 6 (Fig. ) and 'isoglitter' C 8 (Fig. ) due to the similar separation between the arrays of corner sharing C4 tetrahedra.