## 1 Introduction  
Meteorites are an invaluable source of information about both extraterrestrial bodies and the matter in their composition, as well as physico-chemical interactions that take place in extreme conditions, clearly different from those on earth. The study of meteorites also seeks answers related to the origin of organic matter and life on Earth. Among the categories of meteorites identified so far, that of carbonaceous chondrites is a study material of great interest, with researchers suggesting that, by establishing the connection with the parent body and identifying the physico-chemical phenomena associated with the synthesis of materials, the origin of life can be deciphered [1, 2]. In a broader sense, it is about trying to explain the evolution of organic matter and its formation [2, 3, 4, 5]. The weathering of carbonaceous chondrite (CC) meteorites by liquid water has also been studied [1, 6]. From the category of representative CC meteorites, the Murchison, Bell and Allende meteorites, in which the content of organic material was highlighted by FTIR, SEM-EDS and XRD techniques and classical analytical values (such as density and solubility) [7, 8, 9, 10, 11, 4], were intensively studied. The methods to detect traces of elements in meteorites, such as thorium, have been set up during [12] the use of neutron activation analysis. The content of uranium and thorium in chondrite meteorites (CMs) was also studied by [PERSON] and [PERSON] in 1979, by the same neutron activation method [13]. The primitive carbonaceous chondrite, Acfer 094, was analyzed using synchrotron radiation-based X-ray computed nanotomography for a good preservation of the material [14]. In 2014, [PERSON] et al. [15] proved in a simulation model that fragile types of meteorites, i.e., volatile meteorites, may survive at low altitudes due to their protective outgassing sheath of volatile ices and organic material that protect the meteorite from direct atmospheric heating during its fall. The Maribo carbonaceous chondrite meteorite that fell in 2009 in Denmark, contained organic components very similar to the Murchison meteorite, but also specific characteristics, such as components rich in nitrogen as well as trapped noble gases [16].  
The most significant carbon content was identified in IDPs (interplanetary dust particles) with 45 wt% and in UCAMMs (ultra-carbonaceous Antarctic micrometeorites), the latter containing the highest amounts of organic compounds, up to 90 wt% [17; 18; 19].  
This work aims to identify the chemical composition, topography, morphology and crystallinity of two space fragments of rocks that fell to the ground as a result of a large supersonic boom. In order to elucidate the origin of the analyzed pieces, the results were compared with those reported for the carbonaceous chondrite meteorites. The analyses showed similarities with the meteorites presented in the literature, but also certain particularities of special importance. If some of the characteristics are common to a category of meteorites from the same parental body, there are also individual \"traits\" that have formed under particular conditions and interactions. Thus, an individual profile of the space rock fragments was established based on these particularities and which constitute their chemical and petrographic fingerprint similar to genetic for living beings.