Coquina

Coquina (/koʊˈkiːnə/) is a sedimentary rock that is composed either wholly or almost entirely of the transported, abraded, and mechanically sorted fragments of mollusks, trilobites, brachiopods, or other invertebrates.[1][2] The term coquina comes from the Spanish word for "cockle" and "shellfish".[3][4] This material fits Minecraft a lot and also the gimmick could be that it’s easy to mine but has a very high blast resistance and also just kind of look cool and builds and stuff but again that TNT absorption because of its real life properties would be great