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tokens: ACKNOWLEDGEMENTS We would like to thank to Dr. G.B. Rusu from the USAMV, Iasi, Romania for its help during the electron microscopy imaging. Our thanks also go to Dr. R. Jijie, for her contribution during the preliminary phases of the study, and to our colleagues, Dr. G. Borcia, Dr. A. Chiper and Prof. G. Popa, for careful reading of the manuscript and helpful suggestions. This work was supported by the Romanian Space Agency (ROSA) under the project STAR CDI ID 486/2017–2018. The authors also acknowledge the support from the COST action CM1401 (Our Astro-Chemical History).