The main mass slightly resembles a triangular prism with the following maximum diameters: 8x7x12 cm. Although the terrestrial weathering has softened the bulges and depressions produced by regmaglites, the meteorite still exhibits a marked difference between its sides. The inner side is concave and covered with regmaglites 10 to 15 mm in diameter, while the outer side is slightly convex and with less depressions. Although these characteristics are not as evident as in Cabin Creek, we can deduce that this meteorite also maintained its preferred orientation during atmospheric flight. This concave part was facing downwards, suffering the impact directly with the air molecules, while the convex parts were left behind. The sections recorded after a chemical attack show that Pirapora is a hexahedrite in which the Neumann Lines extend across the surface, stopping abruptly in the alpha-2 zone affected by the heat. Troilite occurs as nodules and bars. They are altered by shock events for complexes, worn out and aggregates of fine-grained troilite, daubrelite and a little bit of kamacite and schreibersite. Rabdites are common and schreibersites can be found partially broken around the troilite nodules. Source: Buchwald (1975).