Figure 4. EDS of the fragment, enriched in Mg, Fe and Si, suggesting a remnant of a mafic silicate mineral, or of glass.

Important information about the chemistry of the micro-particles present in LEO can be obtained from analysis of non-dedicated surfaces. Returned spacecraft surfaces should continue to be examined for large numbers of residues, and will yield a valuable resource for interpretation of fluxes. Such studies complement micro-particle sampling by low-density capture-cell technologies such as aerogel [21]. Together, they offer the opportunity to sample large quantities of material, including some that may be relatively intact.

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