[2][3] It consists of material similar to terrestrial basalts or plutonic rocks and has been differentiated and reprocessed to a lesser or greater degree due to melting and recrystallization on or within meteorite parent bodies.

[4][5] As a result, achondrites have distinct textures and mineralogies indicative of igneous processes.

) of them belong to the HED clan, possibly originating from the crust of asteroid Vesta.

[7] Achondrites are classified into the following groups:[8] Primitive achondrites, also called PAC group, are so-called because their chemical composition is primitive in the sense that it is similar to the composition of chondrites, but their texture is igneous, indicative of melting processes.

This means that their mineralogical and chemical composition was changed by melting and crystallization processes.