Igneous meteorites suggest Aluminium-26 heterogeneity in the early Solar Nebula.

The short-lived radionuclide aluminium-26 (Al) isotope is a major heat source for early planetary melting. The aluminium-26 - magnesium-26 (Al-Mg) decay system also serves as a high-resolution relative chronometer. In both cases, however, it is critical to establish whether Al was homogeneously or heterogeneously distributed throughout the solar nebula.