Ironstones or petroplinthites are common materials in soils under humid tropical climate. generally defined as the result of Fe oxide accumulation in areas where the water table oscillates. and may exhibit considerable morphological variability. The aim of this study was to examine the internal structure and porosity of an ironstone fragment from a Petroferric Acrudox in Minas Gerais. https://yeswellneses.shop/product-category/supports/