Zeiss Axio Imager Optical Microscope - CITL MK5-2 Cathode Ray Source 15KeV - 0.7mA The predominance of the blue color emitted by minerals due to the incidence of an electron beam indicates an advanced petrographic type due to thermal metamorphism. Image Credits: Amanda Tosi

Low chondritic texture, typical of petrographic type 5, according to Van Schumus & Wood (1967). Image Credit: M.E. Zucolotto

Transmitted and Polarized Light Image Credits: M.E.Zucolotto

Zeiss Axio Imager Optical Microscope - CITL MK5-2 Cathode Ray Source 15KeV - 0.7mA Image Credit: Amanda Tosi

Backscattered electron image (compo) 15KeV - 20nA Image Credit: Amanda Tosi

Optical Microscope 15KeV - 0.7mA Chondrues with pyroxene and olivine grains emitting red color CL. The dark grain present in the chondrule is a graphite grain. Image Credit: Amanda Tosi

Zeiss Axio Imager Optical Microscope - CITL MK5-2 Cathode Ray Source 15KeV - 0.7mA The lack of yellow in the mesostasis of the chondrules and the dull red, as well as the dark matrix and little predominance of blue, classifies the Chainpur meteorite as a petrographic type 3 of the most primitive, but with evidence of a mild thermal metamorphism. Image Credit: Amanda Tosi

Zeiss Axio Imager Optical Microscope - CITL MK5-2 Cathode Ray Source 15KeV - 0.7mA Condrule with blue mesostasis indicating to be more albitic than anortitic and grains of olivine and pyroxene presenting dull red color, indicative of poor Fe2+ silicates in the composition (since it acts as a CL suppressor). Image Credit: Amanda Tosi

Backscattered electron image (compo) 15KeV - 20nA Image Credit: Amanda Tosi

Small fragment of the Angra dos Reis meteorite. Image Credit: Amanda Tosi

Fragment of the Angra dos Reis meteorite with its wrinkled, dark and shiny fusion crust. Image Credit: M. E. Zucolotto

Fragment of the Angra dos Reis meteorite with its melting crust. Image Credit: André Moutinho

Zeiss Axio Imager Optical Microscope - CITL MK5-2 Cathode Ray Source 15KeV - 0.7mA The presence of red and yellow colors in the chondrules and dark matrix without luminescence indicates that the meteorite suffered mild thermal metamorphism, thus belonging to a petrographic type between 3.0 to 3.4. Image Credits: R. N. Salaverry and A. A. Tosi

Bacscattered image (compo) 15Kev - 20nA Olivine with a heterogeneous chemical border, typical of primitive meteorites, without thermal metamorphism. Image Credit: A.A. Tosi

Transmitted Light Image Credit: R. N. Salaverry

Meteorite fragment Conquest with the thin melting crust on its surface. Image Credit: André Moutinho

Transmitted Light Image credit: Amanda Tosi

Transmitted and Polarized Light Image Credit: Amanda Tosi

Avanhandava meteorite fragment showing the melting crust on the surface and its rocky interior with chondritic texture. Image Credit: M. E. Zucolotto

Transmitted Light It is possible to notice its scarcely chondridic texture, typical of type 5, and few metals (black regions) bordered by iron oxide, due to terrestrial weathering. Image Credit: Amanda Tosi

Transmitted and Polarized Light Image Credit: Amanda Tosi

Fragments of the Campo Sales meteorite. Image Credit: M. E. Zucolotto

Fragment of the Martian meteorite of the Naklite type, Governador Valadares. Image Credit: Norbert Classen (IMCA website)