The aim of the present work is to place the meteorites found on Earth back onto the Moon or planets from where it is assumed they come. In this context, to approach the above issue, we will use phase and elemental analyses of the bulk of the samples (lunar and martian meteorites) through neutron diffraction and NRCA (nuclear resonance capture analysis) respectively and compare the new measurements with previous literature. The aim is to obtain a quantitative determination of the phase distribution and of the isotopes of the contained elements and compare this reliable average composition with previous literature, using only non-invasive techniques.