The search and characterization of original ultra-hard carbon allotropes is an ongoing research field especially with the upstream help of modern materials research software, such as those based on evolutionary crystallography (USPEX) , and particle swarm optimization-based crystal structure prediction (CALYPSO) . The identified carbon allotropes are compiled in the SACADA database to help inform researchers of the origin of the allotropes, organized by topological categories identified with the TopCryst program , e.g. dia for diamond, lon for 'lonsdaleite' (rare hexagonal form of diamond, here identified as C 12 ). Structures are published in the Cambridge Structural Database (CSD) (see for one of the original carbon allotropes studied here, C 9 ). Such structural identifications require further analyses with quantum mechanical calculations to derive quantities that precisely define the desired function, such as the hardness and the mechanical (elastic properties) and dynamic (phonons) stabilities, as well as the electronic band structure. The widely recognized quantum mechanics framework of the Density Functional Theory (DFT) is used in DFT-based computations.