Chemical structure (left) and electrostatic potential projected upon the electron density (right) for most stable (MgSiO₃)₅ P-5 nanocluster isomer (A), and the most stable (Mg₂SiO₄)₄ O-4 nanocluster isomer (B). Atom colour key: Si – yellow, O – red, Mg – pink. The charge density isosurface value is 0.1 e/ų. The electrostatic potential ranges from −0.07 (blue) to 0.07 (red) in AU. The orange arrows indicate the direction of the dipole moment vector.