Low chondritic texture, typical of petrographic type 5, according to Van Schumus & Wood (1967).Image Credit: M.E. Zucolotto
Transmitted and Polarized LightImage Credits: M.E.Zucolotto
Zeiss Axio Imager Optical Microscope - CITL MK5-2 Cathode Ray Source15KeV - 0.7mAThe 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
Chondritic texture and mineral composition of an equilibrated ordinary chondite. Chemical and petrological type is H5. Shock stage S3 and weathering W0.
Backscattered electron image (compo)15KeV - 20nAImage Credit: Amanda Tosi
Optical Microscope15KeV - 0.7mAChondrues 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 Source15KeV - 0.7mAImage Credit: Amanda Tosi
Unequilibrated Ordinary Chondrite LL 3.15, Shock Stage S4, Weathering Stage W0.
Zeiss Axio Imager Optical Microscope - CITL MK5-2 Cathode Ray Source15KeV - 0.7mACondrule 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
Zeiss Axio Imager Optical Microscope - CITL MK5-2 Cathode Ray Source15KeV - 0.7mAThe 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
Unequilibrated Ordinary Chondrite LL 3.4, Shock Stage S1
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
Small fragment of the Angra dos Reis meteorite.Image Credit: Amanda Tosi
Fassaite Achondrite. The Angra dos Reis meteorite is an ultramafic igneous rock or pyroxenite because it is made up of 93% pyroxene. Properly referred to as a Fassaite.
Bacscattered image (compo)15Kev - 20nAOlivine with a heterogeneous chemical border, typical of primitive meteorites, without thermal metamorphism.Image Credit: A.A. Tosi
Transmitted LightImage Credit: R. N. Salaverry
Zeiss Axio Imager Optical Microscope - CITL MK5-2 Cathode Ray Source15KeV - 0.7mAThe 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
Chondritic texture and mineral composition of an unequilibrated ordinary chondrite of the chemical and petrographic type LL3.2. Shock stage S3 and weathering W1.
Meteorite fragment Conquest with the thin melting crust on its surface.Image Credit: André Moutinho
Equilibrated Ordinary Chondrite H4, slightly weathered by terrestrial oxidation.
Transmitted and Polarized LightImage 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 LightImage credit: Amanda Tosi
Equilibrated Ordinary Chondrite H4
Fragments of the Campo Sales meteorite.Image Credit: M. E. Zucolotto
Transmitted LightIt 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
The meteorite is an ordinary chondrite L5 with slight shock stage S1.
Fragment of the Martian meteorite of the Naklite type, Governador Valadares.Image Credit: Norbert Classen (IMCA website)
Governador Valadares is an Augite-Olivine Achondrite, classified as Nakhlite belonging to the SCN clan, which are meteorites from the planet Mars.