Rock

Rock, also known as Earth (not to be confused with the planet named Earth), according to Classical Elemental Theory, is a primary element, and according to Elemental Field Theory is the Gravitic Field in its first energy state.

Classical Elemental Theory (CET)
CET describes Rock as one of the primary elements.

Elemental Field Theory (EFT)
EFT literature primarily refers to the Rock element as Earth. They describe Earth as excitations in the Earth Elemental Field, which resonnates with the Gravitic Field, caused by Earth Elementons.