Fragment of the Santa Luzia meteorite showing the Widmanstatten pattern revealed after the chemical attack on the polished surface. It is classified as a Coarsest Octahedrite due to its wide kamacite lamellae. Chemically it was classified in the IIAB group. Image Credit: André Moutinho

Widmanstatten pattern revealed after treatment with Nital solution on the surface of the meteorite. It is classified as Fine Octahedrite due to the width of its kamacite bands. Image Credit: M. E. Zucolotto

Slice of the São João Nepomuceno meteorite classified as IVA Fine Octahedrite. Image Credit: M. E. Zucolotto and Amanda Tosi

Backscattered electron image (compo) 15KeV - 20nA Widmanstatten pattern with kamacite lamellae and taenite border. Plessite is also present in dark regions. Image Credit: I. P. Ludka

Backscattered electron image (compo) 15KeV - 20nA Image Credit: I. P. Ludka

Fragment of the Uruaçu meteorite showing the Widmanstatten pattern, that classified it as Coarse Octahedrite of the chemical IAB group. Image Credit: André Moutinho

Fragment of the Uruaçu meteorite with its fusion crust oxidized by terrestrial weathering. Image Credit: André Moutinho

Fragment of the Soledade meteorite classified as IAB Coarse Octahedrite. Image Credit: André Moutinho

Width of the kamacite bands, which form the Widmanstatten pattern, revealed when the polished surface of the meteorite was attacked by Nital solution. Image Credit: M. E. Zucolotto

Width of the kamacite bands, which form the Widmanstatten pattern, revealed when the polished surface of the meteorite was attacked by Nital solution. Image Credit: M. E. Zucolotto

Fragment of the Vitória da Conquista meteorite with its fusion crust oxidized by terrestrial weathering. Image Credit: M. E. Zucolotto